935 lines
41 KiB
Objective-C
935 lines
41 KiB
Objective-C
//
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// MPExpressionView.m
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// MathPad
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//
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// Created by Kim Wittenburg on 17.04.14.
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// Copyright (c) 2014 Kim Wittenburg. All rights reserved.
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//
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#import "MPExpressionView.h"
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#import "MPExpression.h"
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#import "MPExpressionElement.h"
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#import "MPPowerFunction.h"
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#import "MPParenthesisFunction.h"
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#import "MPFractionFunction.h"
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#import "MPRangePath.h"
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#import "MPMathRules.h"
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#import "MPExpressionStorage.h"
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#import "MPExpressionLayout.h"
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#import "MPFunctionsViewController.h"
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#import "NSIndexPath+MPAdditions.h"
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@interface MPExpressionView ()
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@property (nonatomic, strong) NSButton *radiansDegreesButton;
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@property (nonatomic, strong) NSButton *functionsButton;
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@property (nonatomic, strong) NSPopover *functionsPopover;
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@property (nonatomic, strong) MPFunctionsViewController *functionsViewController;
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@property (nonatomic, strong) NSTimer *caretTimer;
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@property (nonatomic) NSTimeInterval caretBlinkRate;
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@property (nonatomic) BOOL caretVisible;
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@property (nonatomic, getter = isSelectionModifyingStart) BOOL selectionModifyingStart;
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@property (nonatomic, strong) NSIndexPath *mouseAnchor;
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@end
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@interface MPExpressionView (MPDrawing)
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- (NSPoint)expressionOrigin;
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@end
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@interface MPExpressionView (MPSelection)
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- (void)restartCaretTimer;
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- (void)updateCaret:(NSTimer *)timer;
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- (NSRect)selectionRect;
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- (NSIndexPath *)selectionToTheRightOf:(NSIndexPath *)selectionPath
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byExtendingSelection:(BOOL)extendingSelection
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selectWords:(BOOL)selectWords;
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- (NSIndexPath *)selectionToTheLeftOf:(NSIndexPath *)selectionPath
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byExtendingSelection:(BOOL)extendingSelection
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selectWords:(BOOL)selectWords;
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- (MPRangePath *)rangePathEnclosingAnchorPath:(NSIndexPath *)anchor
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newSelectionPath:(NSIndexPath *)newSelection;
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@end
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@implementation MPExpressionView (MPDrawing)
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- (NSPoint)expressionOrigin
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{
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NSRect expressionBounds = [self.expressionStorage.rootLayout bounds];
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CGFloat y = (self.bounds.size.height - expressionBounds.size.height) / 2 + fabs(expressionBounds.origin.y);
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return NSMakePoint(10, y);
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}
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@end
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@implementation MPExpressionView (MPSelection)
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- (void)restartCaretTimer
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{
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if (self.caretTimer && [self.caretTimer isValid]) {
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[self.caretTimer invalidate];
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}
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self.caretTimer = [NSTimer scheduledTimerWithTimeInterval:self.caretBlinkRate/2 target:self selector:@selector(updateCaret:) userInfo:nil repeats:YES];
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self.caretVisible = NO;
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[self updateCaret:self.caretTimer];
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}
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- (void)updateCaret:(NSTimer *)timer
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{
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self.caretVisible = !self.caretVisible;
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NSRect updatedRect = self.selectionRect;
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NSPoint expressionOrigin = self.expressionOrigin;
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updatedRect.origin.x += expressionOrigin.x;
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updatedRect.origin.y += expressionOrigin.y;
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[self setNeedsDisplayInRect:updatedRect];
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}
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- (NSRect)selectionRect
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{
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NSRect selectionRect = [self.expressionStorage.rootLayout boundingRectForRangePath:self.selection];
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if (self.selection.length == 0) {
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selectionRect.size.width = 1;
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}
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return selectionRect;
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}
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- (NSIndexPath *)selectionToTheRightOf:(NSIndexPath *)selectionPath
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byExtendingSelection:(BOOL)extendingSelection
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selectWords:(BOOL)selectWords
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{
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NSIndexPath *targetExpressionPath = [selectionPath indexPathByRemovingLastIndex];
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MPExpression *targetExpression = [self.expressionStorage elementAtIndexPath:targetExpressionPath];
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NSUInteger locationInTarget = selectionPath.lastIndex;
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NSUInteger locationInElement;
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NSUInteger targetElementIndex = [targetExpression convertIndex:locationInTarget
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fromReferenceFrame:MPSymbolReferenceFrame
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toReferenceFrame:MPElementReferenceFrame
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offset:&locationInElement];
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id<MPExpressionElement> targetElement;
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// There is only a target element if the selection is not the last location in an expression
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if (targetElementIndex < targetExpression.countElements) {
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targetElement = [targetExpression elementAtIndex:targetElementIndex];
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}
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if (!selectWords && !extendingSelection && (locationInElement == 0 || locationInTarget == targetExpression.countSymbols)) {
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// First or last index in an element or expression
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// Last element in the expression
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if (locationInTarget == targetExpression.countSymbols) {
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// The selection is inside a function and should proceed
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if (selectionPath.length > 1) {
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NSIndexPath *functionPath = [[selectionPath indexPathByRemovingLastIndex] indexPathByRemovingLastIndex];
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MPFunctionLayout *functionLayout = (MPFunctionLayout *)[self.expressionStorage.rootLayout childLayoutAtIndexPath:functionPath];
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NSUInteger currentChildIndex = [selectionPath indexPathByRemovingLastIndex].lastIndex;
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NSUInteger newChildIndex = [functionLayout indexOfChildAfterChildAtIndex:currentChildIndex];
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// The function is to be exited
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if (newChildIndex == NSNotFound) {
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targetExpression = [self.expressionStorage elementAtIndexPath:[functionPath indexPathByRemovingLastIndex]];
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NSUInteger functionLocationInExpression = [targetExpression convertIndex:functionPath.lastIndex
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fromReferenceFrame:MPElementReferenceFrame
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toReferenceFrame:MPSymbolReferenceFrame];
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return [functionPath indexPathByReplacingLastIndexWithIndex:functionLocationInExpression+1];
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} else {
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return [[targetExpressionPath indexPathByReplacingLastIndexWithIndex:newChildIndex] indexPathByAddingIndex:0];
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}
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} // else the selection does not change
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// First Element
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} else {
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if ([targetElement isString]) {
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locationInTarget++;
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} else {
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NSIndexPath *targetFunctionPath = [selectionPath indexPathByReplacingLastIndexWithIndex:targetElementIndex];
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MPFunctionLayout *functionLayout = (MPFunctionLayout *)[self.expressionStorage.rootLayout childLayoutAtIndexPath:targetFunctionPath];
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NSUInteger leadingChildIndex = [functionLayout indexOfLeadingChild];
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return [[targetFunctionPath indexPathByAddingIndex:leadingChildIndex] indexPathByAddingIndex:0];
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}
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}
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} else if (locationInTarget < targetExpression.countSymbols) {
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if (selectWords) {
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locationInTarget = [targetExpression convertIndex:targetElementIndex+1
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fromReferenceFrame:MPElementReferenceFrame
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toReferenceFrame:MPSymbolReferenceFrame];
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} else {
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locationInTarget++;
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}
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}
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return [selectionPath indexPathByReplacingLastIndexWithIndex:locationInTarget];
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}
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- (NSIndexPath *)selectionToTheLeftOf:(NSIndexPath *)selectionPath
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byExtendingSelection:(BOOL)extendingSelection
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selectWords:(BOOL)selectWords
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{
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NSIndexPath *targetExpressionPath = [selectionPath indexPathByRemovingLastIndex];
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MPExpression *targetExpression = [self.expressionStorage elementAtIndexPath:targetExpressionPath];
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NSUInteger locationInTarget = selectionPath.lastIndex;
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NSUInteger locationInElement;
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NSUInteger targetElementIndex = [targetExpression convertIndex:locationInTarget
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fromReferenceFrame:MPSymbolReferenceFrame
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toReferenceFrame:MPElementReferenceFrame
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offset:&locationInElement];
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NSUInteger previousElementIndex = targetElementIndex - (locationInElement == 0 ? 1 : 0);
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id<MPExpressionElement> previousElement;
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if (locationInTarget > 0) {
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previousElement = [targetExpression elementAtIndex:previousElementIndex];
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}
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if (!selectWords && !extendingSelection && locationInElement == 0) {
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// First element in expression
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if (locationInTarget == 0) {
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if (selectionPath.length > 1) {
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NSIndexPath *functionPath = [[selectionPath indexPathByRemovingLastIndex] indexPathByRemovingLastIndex];
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MPFunctionLayout *functionLayout = (MPFunctionLayout *)[self.expressionStorage.rootLayout childLayoutAtIndexPath:functionPath];
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NSUInteger currentChildIndex = [selectionPath indexPathByRemovingLastIndex].lastIndex;
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NSUInteger newChildIndex = [functionLayout indexOfChildBeforeChildAtIndex:currentChildIndex];
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// The function is to be exited
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if (newChildIndex == NSNotFound) {
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targetExpression = [self.expressionStorage elementAtIndexPath:[functionPath indexPathByRemovingLastIndex]];
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NSUInteger functionLocationInExpression = [targetExpression convertIndex:functionPath.lastIndex
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fromReferenceFrame:MPElementReferenceFrame
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toReferenceFrame:MPSymbolReferenceFrame];
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return [functionPath indexPathByReplacingLastIndexWithIndex:functionLocationInExpression];
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} else {
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targetExpressionPath = [targetExpressionPath indexPathByReplacingLastIndexWithIndex:newChildIndex];
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targetExpression = [self.expressionStorage elementAtIndexPath:targetExpressionPath];
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return [targetExpressionPath indexPathByAddingIndex:targetExpression.countSymbols];
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}
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} // else the selection does not change
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// Just
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} else {
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if ([previousElement isString]) {
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locationInTarget--;
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} else {
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NSIndexPath *targetFunctionPath = [selectionPath indexPathByReplacingLastIndexWithIndex:previousElementIndex];
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MPFunctionLayout *functionLayout = (MPFunctionLayout *)[self.expressionStorage.rootLayout childLayoutAtIndexPath:targetFunctionPath];
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NSUInteger trailingChildIndex = [functionLayout indexOfTrailingChild];
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targetExpressionPath = [targetFunctionPath indexPathByAddingIndex:trailingChildIndex];
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targetExpression = [self.expressionStorage elementAtIndexPath:targetExpressionPath];
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return [targetExpressionPath indexPathByAddingIndex:targetExpression.countSymbols];
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}
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}
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} else if (locationInTarget > 0) {
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if (selectWords) {
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if (locationInElement == 0) {
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targetElementIndex--;
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}
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locationInTarget = [targetExpression convertIndex:targetElementIndex
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fromReferenceFrame:MPElementReferenceFrame
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toReferenceFrame:MPSymbolReferenceFrame];
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} else {
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locationInTarget--;
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}
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}
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return [selectionPath indexPathByReplacingLastIndexWithIndex:locationInTarget];
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}
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- (MPRangePath *)rangePathEnclosingAnchorPath:(NSIndexPath *)anchorPath
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newSelectionPath:(NSIndexPath *)newSelectionPath
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{
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if ([anchorPath isEqual:newSelectionPath]) {
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return MPMakeRangePath(anchorPath, 0);
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}
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NSIndexPath *commonPath = [anchorPath commonIndexPathWith:newSelectionPath];
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if (commonPath.length == anchorPath.length-1 && commonPath.length == newSelectionPath.length-1) {
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// The two paths point to different locations in the same expression
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NSUInteger anchorIndex = [anchorPath indexAtPosition:commonPath.length];
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NSUInteger newIndex = [newSelectionPath indexAtPosition:commonPath.length];
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NSUInteger minIndex = MIN(anchorIndex, newIndex);
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NSUInteger length = MAX(anchorIndex, newIndex) - minIndex;
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return MPMakeRangePath([commonPath indexPathByAddingIndex:minIndex], length);
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} else {
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if ((commonPath.length & 1) == 1) {
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commonPath = [commonPath indexPathByRemovingLastIndex];
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}
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MPExpression *closestCommonAncestor = [self.expressionStorage elementAtIndexPath:commonPath];
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NSUInteger anchorIndex = [anchorPath indexAtPosition:commonPath.length];
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NSUInteger newIndex = [newSelectionPath indexAtPosition:commonPath.length];
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if (commonPath.length < anchorPath.length-1) {
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anchorIndex = [closestCommonAncestor convertIndex:anchorIndex
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fromReferenceFrame:MPElementReferenceFrame
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toReferenceFrame:MPSymbolReferenceFrame];
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}
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if (commonPath.length < newSelectionPath.length-1) {
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newIndex = [closestCommonAncestor convertIndex:newIndex
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fromReferenceFrame:MPElementReferenceFrame
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toReferenceFrame:MPSymbolReferenceFrame];
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}
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NSUInteger minIndex = MIN(anchorIndex, newIndex);
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if (commonPath.length < anchorPath.length-1 && anchorIndex != minIndex) {
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anchorIndex++;
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} else if (commonPath.length < newSelectionPath.length-1 && newIndex != minIndex) {
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newIndex++;
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}
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NSUInteger length = MAX(anchorIndex, newIndex) - minIndex;
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if (anchorIndex == newIndex) {
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length++;
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}
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MPRangePath *newSelection = MPMakeRangePath([commonPath indexPathByAddingIndex:minIndex], length);
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return newSelection;
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}
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}
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@end
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@implementation MPExpressionView
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#pragma mark Creation Methods
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- (id)initWithFrame:(NSRect)frame
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{
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self = [super initWithFrame:frame];
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if (self) {
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[self initializeExpressionView];
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}
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return self;
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}
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- (id)initWithCoder:(NSCoder *)aDecoder
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{
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self = [super initWithCoder:aDecoder];
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if (self) {
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[self initializeExpressionView];
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}
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return self;
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}
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- (void)initializeExpressionView
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{
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// Setup the Expression Storage
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MPExpressionStorage *expressionStorage = [[MPExpressionStorage alloc] init];
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expressionStorage.expressionView = self;
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_expressionStorage = expressionStorage;
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[self initializeButtons];
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[self initializeErrorMessageTextField];
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self.selection = [[MPRangePath alloc] initWithRange:NSMakeRange(0, 0)];
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self.caretBlinkRate = 1.0;
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[self restartCaretTimer];
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}
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- (void)initializeButtons
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{
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NSButton *radiansDegreesButton = self.radiansDegreesButton;
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[self addSubview:radiansDegreesButton];
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NSButton *functionsButton = self.functionsButton;
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[self addSubview:functionsButton];
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NSDictionary *variableBindings = NSDictionaryOfVariableBindings(radiansDegreesButton, functionsButton);
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[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-10-[radiansDegreesButton]"
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options:0
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metrics:nil
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views:variableBindings]];
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[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-10-[radiansDegreesButton]"
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options:0
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metrics:nil
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views:variableBindings]];
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[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[functionsButton]-10-|"
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options:0
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metrics:nil
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views:variableBindings]];
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[self addConstraint:[NSLayoutConstraint constraintWithItem:functionsButton
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attribute:NSLayoutAttributeCenterY
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relatedBy:NSLayoutRelationEqual
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toItem:self
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attribute:NSLayoutAttributeCenterY
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multiplier:1
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constant:0]];
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}
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- (void)initializeErrorMessageTextField
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{
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NSTextField *errorLabel = self.errorMessageTextField;
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[self addSubview:errorLabel];
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NSDictionary *variableBindings = NSDictionaryOfVariableBindings(errorLabel);
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[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-10-[errorLabel]"
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options:0
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metrics:nil
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views:variableBindings]];
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[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[errorLabel]-10-|"
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options:0
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metrics:nil
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views:variableBindings]];
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}
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#pragma mark Properties
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- (void)setExpressionStorage:(MPExpressionStorage *)expressionStorage
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{
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_expressionStorage.expressionView = nil;
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_expressionStorage = expressionStorage;;
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_expressionStorage.expressionView = self;
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[self invalidateIntrinsicContentSize];
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}
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- (void)setSelection:(MPRangePath *)selection
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{
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_selection = selection;
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[self restartCaretTimer];
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self.needsDisplay = YES;
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}
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- (NSButton *)radiansDegreesButton
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{
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if (!_radiansDegreesButton) {
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NSButton *radiansDegreesButton = [[NSButton alloc] initWithFrame:NSZeroRect];
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radiansDegreesButton.translatesAutoresizingMaskIntoConstraints = NO;
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radiansDegreesButton.buttonType = NSMomentaryPushInButton;
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radiansDegreesButton.bordered = YES;
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radiansDegreesButton.bezelStyle = NSRoundedBezelStyle;
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radiansDegreesButton.imagePosition = NSNoImage;
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radiansDegreesButton.alignment = NSCenterTextAlignment;
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radiansDegreesButton.title = NSLocalizedString([MPMathRules sharedRules].isUsingDegrees ? @"Deg" : @"Rad", nil);
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radiansDegreesButton.font = [NSFont systemFontOfSize:[NSFont systemFontSizeForControlSize:NSRegularControlSize]];
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radiansDegreesButton.target = self;
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radiansDegreesButton.action = @selector(switchRadiansDegrees:);
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_radiansDegreesButton = radiansDegreesButton;
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}
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return _radiansDegreesButton;
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}
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- (NSButton *)functionsButton
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{
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if (!_functionsButton) {
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NSBundle *frameworkBundle = [NSBundle bundleForClass:[self class]];
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NSImage *image = [frameworkBundle imageForResource:@"FunctionsButtonDisclosure"];
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[image setName:@"FunctionsButtonDisclosure"];
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NSButton *button = [[NSButton alloc] initWithFrame:NSZeroRect];
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button.translatesAutoresizingMaskIntoConstraints = NO;
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button.target = self;
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button.action = @selector(showFunctions:);
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button.buttonType = NSMomentaryChangeButton;
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button.bezelStyle = NSShadowlessSquareBezelStyle;
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button.bordered = NO;
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NSFont *font = [NSFont fontWithName:@"Times New Roman" size:25.0];
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NSAttributedString *attributedTitle = [[NSAttributedString alloc] initWithString:@"Σ" attributes:@{NSFontAttributeName: font, NSForegroundColorAttributeName: [NSColor colorWithWhite:.61 alpha:1]}];
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button.attributedTitle = attributedTitle;
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button.imagePosition = NSImageLeft;
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button.image = image;
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_functionsButton = button;
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}
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return _functionsButton;
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}
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- (NSTextField *)errorMessageTextField
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{
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if (!_errorMessageTextField) {
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NSTextField *label = [[NSTextField alloc] initWithFrame:NSZeroRect];
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label.textColor = [NSColor redColor];
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label.translatesAutoresizingMaskIntoConstraints = NO;
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label.bezeled = NO;
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label.drawsBackground = NO;
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label.editable = NO;
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label.selectable = NO;
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_errorMessageTextField = label;
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}
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return _errorMessageTextField;
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}
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#pragma mark Actions
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- (void)switchRadiansDegrees:(id)sender
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{
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[MPMathRules sharedRules].isUsingDegrees = ![MPMathRules sharedRules].isUsingDegrees;
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self.radiansDegreesButton.title = NSLocalizedString([MPMathRules sharedRules].isUsingDegrees ? @"Deg" : @"Rad", nil);
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}
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- (void)showFunctions:(id)sender
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{
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if (self.functionsPopover == nil || self.functionsViewController == nil) {
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self.functionsViewController = [[MPFunctionsViewController alloc] init];
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self.functionsViewController.target = self;
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self.functionsViewController.action = @selector(insertFunction:);
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self.functionsPopover = [[NSPopover alloc] init];
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self.functionsPopover.contentViewController = self.functionsViewController;
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self.functionsPopover.animates = YES;
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self.functionsPopover.behavior = NSPopoverBehaviorSemitransient;
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}
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if (self.functionsPopover.isShown) {
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[self.functionsPopover close];
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} else {
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[self.functionsPopover showRelativeToRect:[sender bounds] ofView:sender preferredEdge:NSMaxYEdge];
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}
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}
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- (void)insertFunction:(MPFunction *)function
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{
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[self.functionsPopover close];
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[self.expressionStorage replaceItemsInRangePath:self.selection
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referenceFrame:MPSymbolReferenceFrame
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withElements:@[function]];
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MPExpression *targetExpression = [self.expressionStorage elementAtIndexPath:[self.selection.location indexPathByRemovingLastIndex]];
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|
NSUInteger functionElementIndex = [targetExpression convertIndex:self.selection.location.lastIndex
|
|
fromReferenceFrame:MPSymbolReferenceFrame
|
|
toReferenceFrame:MPElementReferenceFrame];
|
|
NSIndexPath *functionPath = [self.selection.location indexPathByReplacingLastIndexWithIndex:functionElementIndex];
|
|
MPFunctionLayout *functionLayout = (MPFunctionLayout *)[self.expressionStorage.rootLayout childLayoutAtIndexPath:functionPath];
|
|
self.selection = MPMakeRangePath([[functionPath indexPathByAddingIndex:functionLayout.indexOfLeadingChild] indexPathByAddingIndex:0], 0);
|
|
}
|
|
|
|
#pragma mark NSView Stuff
|
|
- (BOOL)acceptsFirstResponder
|
|
{
|
|
return YES;
|
|
}
|
|
|
|
- (BOOL)canBecomeKeyView
|
|
{
|
|
return YES;
|
|
}
|
|
|
|
- (BOOL)becomeFirstResponder
|
|
{
|
|
[self restartCaretTimer];
|
|
return [super becomeFirstResponder];
|
|
}
|
|
|
|
- (BOOL)resignFirstResponder
|
|
{
|
|
[self.caretTimer invalidate];
|
|
self.caretVisible = NO;
|
|
self.needsDisplay = YES;
|
|
return [super resignFirstResponder];
|
|
}
|
|
|
|
- (BOOL)isFlipped
|
|
{
|
|
return NO;
|
|
}
|
|
|
|
- (BOOL)isOpaque
|
|
{
|
|
return YES;
|
|
}
|
|
|
|
- (void)setFrame:(NSRect)frameRect
|
|
{
|
|
[self setNeedsLayout:YES];
|
|
[super setFrame:frameRect];
|
|
}
|
|
|
|
- (NSSize)intrinsicContentSize
|
|
{
|
|
NSSize size = self.expressionStorage.rootLayout.bounds.size;
|
|
size.width += 100;
|
|
return size;
|
|
}
|
|
|
|
- (void)resetCursorRects
|
|
{
|
|
[self addCursorRect:self.bounds
|
|
cursor:[NSCursor IBeamCursor]];
|
|
}
|
|
|
|
#pragma mark Key Event Handling
|
|
- (void)keyDown:(NSEvent *)theEvent
|
|
{
|
|
NSString *characters = theEvent.characters;
|
|
|
|
if ([characters isEqualToString:@"("]) {
|
|
[self insertParenthesisFunction:nil];
|
|
return;
|
|
}
|
|
if (theEvent.keyCode == 10) {
|
|
[self insertPowerFunction];
|
|
return;
|
|
}
|
|
if ([characters isEqualToString:@"/"]) {
|
|
[self insertFractionFunction];
|
|
return;
|
|
}
|
|
|
|
NSString *decimalSeparator = [NSRegularExpression escapedPatternForString:[[NSLocale currentLocale] objectForKey:NSLocaleDecimalSeparator]];
|
|
NSMutableCharacterSet *allowedCharacters = [NSMutableCharacterSet alphanumericCharacterSet];
|
|
[allowedCharacters addCharactersInString:[NSString stringWithFormat:@"+-*= !%@", decimalSeparator]];
|
|
|
|
if (characters.length == 1 && [characters stringByTrimmingCharactersInSet:allowedCharacters].length == 0) {
|
|
if ([characters isEqualToString:@"*"]) {
|
|
characters = @"⋅";
|
|
}
|
|
[self.expressionStorage replaceItemsInRangePath:self.selection
|
|
referenceFrame:MPSymbolReferenceFrame
|
|
withElements:@[characters]];
|
|
self.selection = MPMakeRangePath([self.selection.location indexPathByIncrementingLastIndex], 0);
|
|
} else {
|
|
[self interpretKeyEvents:@[theEvent]];
|
|
}
|
|
}
|
|
|
|
- (void)insertParenthesisFunction:(id)sender
|
|
{
|
|
MPExpression *selectedElementsExpression = [self.expressionStorage subexpressionWithRangePath:self.selection
|
|
referenceFrame:MPSymbolReferenceFrame];
|
|
MPParenthesisFunction *function = [[MPParenthesisFunction alloc] init];
|
|
function.expression = selectedElementsExpression;
|
|
[self.expressionStorage replaceItemsInRangePath:self.selection
|
|
referenceFrame:MPSymbolReferenceFrame
|
|
withElements:@[function]];
|
|
|
|
MPExpression *targetExpression = [self.expressionStorage elementAtIndexPath:[self.selection.location indexPathByRemovingLastIndex]];
|
|
NSUInteger functionElementIndex = [targetExpression convertIndex:self.selection.location.lastIndex
|
|
fromReferenceFrame:MPSymbolReferenceFrame
|
|
toReferenceFrame:MPElementReferenceFrame];
|
|
NSIndexPath *functionPath = [self.selection.location indexPathByReplacingLastIndexWithIndex:functionElementIndex];
|
|
self.selection = MPMakeRangePath([[functionPath indexPathByAddingIndex:0] indexPathByAddingIndex:0], self.selection.length);
|
|
}
|
|
|
|
- (void)insertPowerFunction
|
|
{
|
|
MPExpression *selectedElementsExpression = [self.expressionStorage subexpressionWithRangePath:self.selection
|
|
referenceFrame:MPSymbolReferenceFrame];
|
|
MPPowerFunction *function = [[MPPowerFunction alloc] init];
|
|
function.exponentExpression = selectedElementsExpression;
|
|
[self.expressionStorage replaceItemsInRangePath:self.selection
|
|
referenceFrame:MPSymbolReferenceFrame
|
|
withElements:@[function]];
|
|
|
|
MPExpression *targetExpression = [self.expressionStorage elementAtIndexPath:[self.selection.location indexPathByRemovingLastIndex]];
|
|
NSUInteger functionElementIndex = [targetExpression convertIndex:self.selection.location.lastIndex
|
|
fromReferenceFrame:MPSymbolReferenceFrame
|
|
toReferenceFrame:MPElementReferenceFrame];
|
|
NSIndexPath *functionPath = [self.selection.location indexPathByReplacingLastIndexWithIndex:functionElementIndex];
|
|
self.selection = MPMakeRangePath([[functionPath indexPathByAddingIndex:0] indexPathByAddingIndex:0], self.selection.length);
|
|
}
|
|
|
|
- (void)insertFractionFunction
|
|
{
|
|
MPExpression *selectedElementsExpression = [self.expressionStorage subexpressionWithRangePath:self.selection
|
|
referenceFrame:MPSymbolReferenceFrame];
|
|
MPFractionFunction *function = [[MPFractionFunction alloc] init];
|
|
function.nominatorExpression = selectedElementsExpression;
|
|
[self.expressionStorage replaceItemsInRangePath:self.selection
|
|
referenceFrame:MPSymbolReferenceFrame
|
|
withElements:@[function]];
|
|
MPExpression *targetExpression = [self.expressionStorage elementAtIndexPath:[self.selection.location indexPathByRemovingLastIndex]];
|
|
NSUInteger functionElementIndex = [targetExpression convertIndex:self.selection.location.lastIndex
|
|
fromReferenceFrame:MPSymbolReferenceFrame
|
|
toReferenceFrame:MPElementReferenceFrame];
|
|
NSIndexPath *functionPath = [self.selection.location indexPathByReplacingLastIndexWithIndex:functionElementIndex];
|
|
self.selection = MPMakeRangePath([[functionPath indexPathByAddingIndex:1] indexPathByAddingIndex:0], 0);
|
|
}
|
|
|
|
- (void)insertNewline:(id)sender
|
|
{
|
|
if (self.target && self.action) {
|
|
[self.target performSelector:self.action
|
|
withObject:self
|
|
afterDelay:0.0];
|
|
}
|
|
}
|
|
|
|
- (void)moveRight:(id)sender
|
|
{
|
|
if (self.selection.length > 0) {
|
|
self.selection = MPMakeRangePath(self.selection.maxRangePath, 0);
|
|
} else {
|
|
NSIndexPath *newSelectionLocation = [self selectionToTheRightOf:self.selection.location
|
|
byExtendingSelection:NO
|
|
selectWords:NO];
|
|
self.selection = MPMakeRangePath(newSelectionLocation, 0);
|
|
}
|
|
}
|
|
|
|
- (void)moveLeft:(id)sender
|
|
{
|
|
if (self.selection.length > 0) {
|
|
self.selection = MPMakeRangePath(self.selection.location, 0);
|
|
} else {
|
|
NSIndexPath *newSelectionLocation = [self selectionToTheLeftOf:self.selection.location
|
|
byExtendingSelection:NO
|
|
selectWords:NO];
|
|
self.selection = MPMakeRangePath(newSelectionLocation, 0);
|
|
}
|
|
}
|
|
|
|
- (void)moveWordRight:(id)sender
|
|
{
|
|
NSIndexPath *location = self.selection.maxRangePath;
|
|
NSIndexPath *newSelectionLocation = [self selectionToTheRightOf:location
|
|
byExtendingSelection:NO
|
|
selectWords:YES];
|
|
self.selection = MPMakeRangePath(newSelectionLocation, 0);
|
|
}
|
|
|
|
- (void)moveWordLeft:(id)sender
|
|
{
|
|
NSIndexPath *location = self.selection.location;
|
|
NSIndexPath *newSelectionLocation = [self selectionToTheLeftOf:location
|
|
byExtendingSelection:NO
|
|
selectWords:YES];
|
|
self.selection = MPMakeRangePath(newSelectionLocation, 0);
|
|
}
|
|
|
|
- (void)moveToBeginningOfLine:(id)sender
|
|
{
|
|
self.selection = MPMakeRangePath([self.selection.location indexPathByReplacingLastIndexWithIndex:0], 0);
|
|
}
|
|
|
|
- (void)moveToEndOfLine:(id)sender
|
|
{
|
|
MPExpression *targetExpression = [self.expressionStorage elementAtIndexPath:[self.selection.location indexPathByRemovingLastIndex]];
|
|
self.selection = MPMakeRangePath([self.selection.location indexPathByReplacingLastIndexWithIndex:targetExpression.countSymbols], 0);
|
|
}
|
|
|
|
- (void)moveLeftAndModifySelection:(id)sender
|
|
{
|
|
if (self.selection.length == 0) {
|
|
self.selectionModifyingStart = YES;
|
|
}
|
|
NSIndexPath *location = self.selection.location;
|
|
NSIndexPath *maxLocation = self.selection.maxRangePath;
|
|
if (self.selectionModifyingStart) {
|
|
location = [self selectionToTheLeftOf:location
|
|
byExtendingSelection:YES
|
|
selectWords:NO];
|
|
} else {
|
|
maxLocation = [self selectionToTheLeftOf:maxLocation
|
|
byExtendingSelection:YES
|
|
selectWords:NO];
|
|
}
|
|
self.selection = [self rangePathEnclosingAnchorPath:maxLocation newSelectionPath:location];
|
|
}
|
|
|
|
- (void)moveRightAndModifySelection:(id)sender
|
|
{
|
|
if (self.selection.length == 0) {
|
|
self.selectionModifyingStart = NO;
|
|
}
|
|
NSIndexPath *location = self.selection.location;
|
|
NSIndexPath *maxLocation = self.selection.maxRangePath;
|
|
|
|
if (self.selectionModifyingStart) {
|
|
location = [self selectionToTheRightOf:location
|
|
byExtendingSelection:YES
|
|
selectWords:NO];
|
|
} else {
|
|
maxLocation = [self selectionToTheRightOf:maxLocation
|
|
byExtendingSelection:YES
|
|
selectWords:NO];
|
|
}
|
|
self.selection = MPMakeRangePath(location, maxLocation.lastIndex-location.lastIndex);
|
|
}
|
|
|
|
- (void)moveWordRightAndModifySelection:(id)sender
|
|
{
|
|
if (self.selection.length == 0) {
|
|
self.selectionModifyingStart = NO;
|
|
}
|
|
NSIndexPath *location = self.selection.location;
|
|
NSIndexPath *maxLocation = self.selection.maxRangePath;
|
|
if (self.selectionModifyingStart) {
|
|
location = [self selectionToTheRightOf:location
|
|
byExtendingSelection:YES
|
|
selectWords:YES];
|
|
if (location.lastIndex > maxLocation.lastIndex) {
|
|
location = [location indexPathByReplacingLastIndexWithIndex:maxLocation.lastIndex];
|
|
}
|
|
} else {
|
|
maxLocation = [self selectionToTheRightOf:maxLocation
|
|
byExtendingSelection:YES
|
|
selectWords:YES];
|
|
}
|
|
self.selection = MPMakeRangePath(location, maxLocation.lastIndex-location.lastIndex);
|
|
}
|
|
|
|
- (void)moveWordLeftAndModifySelection:(id)sender
|
|
{
|
|
if (self.selection.length == 0) {
|
|
self.selectionModifyingStart = YES;
|
|
}
|
|
NSIndexPath *location = self.selection.location;
|
|
NSIndexPath *maxLocation = self.selection.maxRangePath;
|
|
if (self.selectionModifyingStart) {
|
|
location = [self selectionToTheLeftOf:location
|
|
byExtendingSelection:YES
|
|
selectWords:YES];
|
|
} else {
|
|
maxLocation = [self selectionToTheLeftOf:maxLocation
|
|
byExtendingSelection:YES
|
|
selectWords:YES];
|
|
if (maxLocation.lastIndex < location.lastIndex) {
|
|
maxLocation = [maxLocation indexPathByReplacingLastIndexWithIndex:location.lastIndex];
|
|
}
|
|
}
|
|
self.selection = MPMakeRangePath(location, maxLocation.lastIndex-location.lastIndex);
|
|
}
|
|
|
|
- (void)moveUp:(id)sender
|
|
{
|
|
NSIndexPath *targetExpressionPath = [self.selection.location indexPathByRemovingLastIndex];
|
|
MPExpression *targetExpression = [self.expressionStorage elementAtIndexPath:targetExpressionPath];
|
|
if (targetExpression.parent != nil) {
|
|
NSIndexPath *functionPath = [targetExpressionPath indexPathByRemovingLastIndex];
|
|
MPFunctionLayout *functionLayout = (MPFunctionLayout *)[self.expressionStorage.rootLayout childLayoutAtIndexPath:functionPath];
|
|
NSUInteger newChildIndex = [functionLayout indexOfChildAboveChildAtIndex:targetExpressionPath.lastIndex];
|
|
self.selection = MPMakeRangePath([[targetExpressionPath indexPathByReplacingLastIndexWithIndex:newChildIndex] indexPathByAddingIndex:0], 0);
|
|
}
|
|
}
|
|
|
|
- (void)moveDown:(id)sender
|
|
{
|
|
NSIndexPath *targetExpressionPath = [self.selection.location indexPathByRemovingLastIndex];
|
|
MPExpression *targetExpression = [self.expressionStorage elementAtIndexPath:targetExpressionPath];
|
|
if (targetExpression.parent != nil) {
|
|
NSIndexPath *functionPath = [targetExpressionPath indexPathByRemovingLastIndex];
|
|
MPFunctionLayout *functionLayout = (MPFunctionLayout *)[self.expressionStorage.rootLayout childLayoutAtIndexPath:functionPath];
|
|
NSUInteger newChildIndex = [functionLayout indexOfChildBelowChildAtIndex:targetExpressionPath.lastIndex];
|
|
self.selection = MPMakeRangePath([[targetExpressionPath indexPathByReplacingLastIndexWithIndex:newChildIndex] indexPathByAddingIndex:0], 0);
|
|
}
|
|
}
|
|
|
|
- (void)selectAll:(id)sender
|
|
{
|
|
NSIndexPath *location = [NSIndexPath indexPathWithIndex:0];
|
|
self.selection = MPMakeRangePath(location, self.expressionStorage.countSymbols);
|
|
}
|
|
|
|
- (void)deleteBackward:(id)sender
|
|
{
|
|
if (self.selection.length > 0) {
|
|
[self.expressionStorage replaceItemsInRangePath:self.selection
|
|
referenceFrame:MPSymbolReferenceFrame
|
|
withElements:@[]];
|
|
self.selection = MPMakeRangePath(self.selection.location, 0);
|
|
} else if (self.selection.location.lastIndex > 0) {
|
|
MPExpression *targetExpression = [self.expressionStorage elementAtIndexPath:[self.selection.location indexPathByRemovingLastIndex]];
|
|
id<MPExpressionElement> elementToDelete = [targetExpression elementAtIndex:[targetExpression convertIndex:self.selection.location.lastIndex-1
|
|
fromReferenceFrame:MPSymbolReferenceFrame
|
|
toReferenceFrame:MPElementReferenceFrame]];
|
|
if ([elementToDelete isFunction]) {
|
|
self.selection = MPMakeRangePath(self.selection.location.indexPathByDecrementingLastIndex, 1);
|
|
} else {
|
|
[targetExpression replaceItemsInRange:NSMakeRange(self.selection.location.lastIndex-1, 1)
|
|
referenceFrame:MPSymbolReferenceFrame
|
|
withElements:@[]];
|
|
self.selection = MPMakeRangePath([self.selection.location indexPathByDecrementingLastIndex], 0);
|
|
}
|
|
} else {
|
|
NSIndexPath *targetExpressionPath = [self.selection.location indexPathByRemovingLastIndex];
|
|
MPExpression *targetExpression = [self.expressionStorage elementAtIndexPath:targetExpressionPath];
|
|
if (targetExpression.parent != nil) {
|
|
NSIndexPath *functionPath = [targetExpressionPath indexPathByRemovingLastIndex];
|
|
MPFunction *function = [self.expressionStorage elementAtIndexPath:functionPath];
|
|
MPFunctionLayout *functionLayout = (MPFunctionLayout *)[self.expressionStorage.rootLayout childLayoutAtIndexPath:functionPath];
|
|
NSIndexSet *remainingIndexes = [functionLayout indexesOfRemainingChildren];
|
|
|
|
NSMutableArray *remainder = [[NSMutableArray alloc] init];
|
|
for (NSUInteger index = remainingIndexes.firstIndex;
|
|
index <= remainingIndexes.lastIndex;
|
|
index = [remainingIndexes indexGreaterThanIndex:index]) {
|
|
MPExpression *expression = [function childAtIndex:index];
|
|
[remainder addObjectsFromArray:[expression allItemsInReferenceFrame:MPElementReferenceFrame]];
|
|
}
|
|
|
|
NSIndexPath *newTargetExpressionPath = [functionPath indexPathByRemovingLastIndex];
|
|
MPExpression *newTargetExpression = [self.expressionStorage elementAtIndexPath:newTargetExpressionPath];
|
|
NSUInteger newSelectionElementIndex = [newTargetExpression convertIndex:functionPath.lastIndex
|
|
fromReferenceFrame:MPElementReferenceFrame
|
|
toReferenceFrame:MPSymbolReferenceFrame];
|
|
NSIndexPath *newSelectionLocation = [functionPath indexPathByReplacingLastIndexWithIndex:newSelectionElementIndex];
|
|
|
|
[self.expressionStorage replaceItemsInRangePath:MPMakeRangePath(newSelectionLocation, 1)
|
|
referenceFrame:MPSymbolReferenceFrame
|
|
withElements:remainder];
|
|
self.selection = MPMakeRangePath(newSelectionLocation, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
#pragma mark Mouse Event Handling
|
|
- (void)mouseDown:(NSEvent *)theEvent
|
|
{
|
|
NSPoint pointInView = [self convertPoint:theEvent.locationInWindow
|
|
fromView:nil];
|
|
NSPoint expressionOrigin = self.expressionOrigin;
|
|
pointInView.x -= expressionOrigin.x;
|
|
pointInView.y -= expressionOrigin.y;
|
|
NSIndexPath *selectionPath = [self.expressionStorage.rootLayout indexPathForMousePoint:pointInView];
|
|
self.mouseAnchor = selectionPath;
|
|
self.selection = MPMakeRangePath(selectionPath, 0);
|
|
}
|
|
|
|
- (void)mouseDragged:(NSEvent *)theEvent
|
|
{
|
|
NSPoint pointInView = [self convertPoint:theEvent.locationInWindow
|
|
fromView:nil];
|
|
NSPoint expressionOrigin = self.expressionOrigin;
|
|
pointInView.x -= expressionOrigin.x;
|
|
pointInView.y -= expressionOrigin.y;
|
|
NSIndexPath *mouseSelectionPath = [self.expressionStorage.rootLayout indexPathForMousePoint:pointInView];
|
|
|
|
self.selection = [self rangePathEnclosingAnchorPath:self.mouseAnchor
|
|
newSelectionPath:mouseSelectionPath];
|
|
}
|
|
|
|
#pragma mark Drawing Methods
|
|
- (void)drawRect:(NSRect)dirtyRect
|
|
{
|
|
// Draw the background
|
|
[super drawRect:dirtyRect];
|
|
[[NSColor whiteColor] set];
|
|
NSRectFill(dirtyRect);
|
|
|
|
// Calculate the position of the expression (probably also forces layout of the expression the first time)
|
|
NSPoint expressionOrigin = self.expressionOrigin;
|
|
|
|
NSAffineTransform *transform = [NSAffineTransform transform];
|
|
[transform translateXBy:expressionOrigin.x
|
|
yBy:expressionOrigin.y];
|
|
[transform concat];
|
|
|
|
// Draw the selection
|
|
if (self.caretVisible || self.selection.length > 0) {
|
|
if (self.selection.length == 0) {
|
|
[[NSColor blackColor] set];
|
|
} else {
|
|
[[NSColor selectedTextBackgroundColor] set];
|
|
}
|
|
NSRectFill([self selectionRect]);
|
|
}
|
|
|
|
[transform invert];
|
|
[transform concat];
|
|
|
|
// Draw the expression
|
|
[[NSColor textColor] set];
|
|
[self.expressionStorage.rootLayout drawAtPoint:expressionOrigin];
|
|
}
|
|
|
|
@end
|