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185 lines
6.1 KiB
185 lines
6.1 KiB
//
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// SlackTextViewController
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// https://github.com/slackhq/SlackTextViewController
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//
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// Copyright 2014-2016 Slack Technologies, Inc.
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// Licence: MIT-Licence
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//
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#import "SLKTextView+SLKAdditions.h"
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@implementation SLKTextView (SLKAdditions)
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- (void)slk_clearText:(BOOL)clearUndo
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{
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// Important to call self implementation, as SLKTextView overrides setText: to add additional features.
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[self setAttributedText:nil];
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if (self.undoManagerEnabled && clearUndo) {
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[self.undoManager removeAllActions];
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}
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}
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- (void)slk_scrollToCaretPositonAnimated:(BOOL)animated
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{
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if (animated) {
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[self scrollRangeToVisible:self.selectedRange];
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}
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else {
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[UIView performWithoutAnimation:^{
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[self scrollRangeToVisible:self.selectedRange];
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}];
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}
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}
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- (void)slk_scrollToBottomAnimated:(BOOL)animated
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{
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CGRect rect = [self caretRectForPosition:self.selectedTextRange.end];
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rect.size.height += self.textContainerInset.bottom;
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if (animated) {
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[self scrollRectToVisible:rect animated:animated];
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}
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else {
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[UIView performWithoutAnimation:^{
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[self scrollRectToVisible:rect animated:NO];
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}];
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}
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}
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- (void)slk_insertNewLineBreak
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{
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[self slk_insertTextAtCaretRange:@"\n"];
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// if the text view cannot expand anymore, scrolling to bottom are not animated to fix a UITextView issue scrolling twice.
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BOOL animated = !self.isExpanding;
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//Detected break. Should scroll to bottom if needed.
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dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.0125 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
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[self slk_scrollToBottomAnimated:animated];
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});
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}
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- (void)slk_insertTextAtCaretRange:(NSString *)text
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{
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NSRange range = [self slk_insertText:text inRange:self.selectedRange];
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self.selectedRange = NSMakeRange(range.location, 0);
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}
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- (void)slk_insertTextAtCaretRange:(NSString *)text withAttributes:(NSDictionary<NSString *, id> *)attributes
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{
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NSRange range = [self slk_insertText:text withAttributes:attributes inRange:self.selectedRange];
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self.selectedRange = NSMakeRange(range.location, 0);
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}
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- (NSRange)slk_insertText:(NSString *)text inRange:(NSRange)range
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{
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NSAttributedString *attributedText = [self slk_defaultAttributedStringForText:text];
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return [self slk_insertAttributedText:attributedText inRange:range];
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}
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- (NSRange)slk_insertText:(NSString *)text withAttributes:(NSDictionary<NSString *, id> *)attributes inRange:(NSRange)range
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{
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NSAttributedString *attributedText = [[NSAttributedString alloc] initWithString:text attributes:attributes];
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return [self slk_insertAttributedText:attributedText inRange:range];
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}
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- (NSAttributedString *)slk_setAttributes:(NSDictionary<NSString *, id> *)attributes
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inRange:(NSRange)range
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{
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NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] initWithAttributedString:self.attributedText];
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[attributedText setAttributes:attributes range:range];
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[self setAttributedText:attributedText];
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return self.attributedText;
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}
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- (void)slk_insertAttributedTextAtCaretRange:(NSAttributedString *)attributedText
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{
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NSRange range = [self slk_insertAttributedText:attributedText inRange:self.selectedRange];
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self.selectedRange = NSMakeRange(range.location, 0);
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}
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- (NSRange)slk_insertAttributedText:(NSAttributedString *)attributedText inRange:(NSRange)range
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{
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// Skip if the attributed text is empty
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if (attributedText.length == 0) {
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return NSMakeRange(0, 0);
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}
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// Registers for undo management
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[self slk_prepareForUndo:@"Attributed text appending"];
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// Append the new string at the caret position
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if (range.length == 0)
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{
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NSAttributedString *leftAttributedString = [self.attributedText attributedSubstringFromRange:NSMakeRange(0, range.location)];
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NSAttributedString *rightAttributedString = [self.attributedText attributedSubstringFromRange:NSMakeRange(range.location, self.attributedText.length-range.location)];
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NSMutableAttributedString *newAttributedText = [NSMutableAttributedString new];
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[newAttributedText appendAttributedString:leftAttributedString];
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[newAttributedText appendAttributedString:attributedText];
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[newAttributedText appendAttributedString:rightAttributedString];
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[self setAttributedText:newAttributedText];
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range.location += attributedText.length;
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return range;
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}
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// Some text is selected, so we replace it with the new text
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else if (range.location != NSNotFound && range.length > 0)
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{
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NSMutableAttributedString *mutableAttributeText = [[NSMutableAttributedString alloc] initWithAttributedString:self.attributedText];
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[mutableAttributeText replaceCharactersInRange:range withAttributedString:attributedText];
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[self setAttributedText:mutableAttributeText];
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range.location += self.attributedText.length;
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return range;
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}
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// No text has been inserted, but still return the caret range
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return self.selectedRange;
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}
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- (void)slk_clearAllAttributesInRange:(NSRange)range
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{
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NSMutableAttributedString *mutableAttributedText = [[NSMutableAttributedString alloc] initWithAttributedString:self.attributedText];
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[mutableAttributedText setAttributes:nil range:range];
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[self setAttributedText:mutableAttributedText];
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}
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- (NSAttributedString *)slk_defaultAttributedStringForText:(NSString *)text
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{
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NSMutableDictionary *attributes = [NSMutableDictionary dictionary];
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if (self.textColor) {
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attributes[NSForegroundColorAttributeName] = self.textColor;
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}
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if (self.font) {
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attributes[NSFontAttributeName] = self.font;
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}
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return [[NSAttributedString alloc] initWithString:text attributes:attributes];
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}
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- (void)slk_prepareForUndo:(NSString *)description
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{
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if (!self.undoManagerEnabled) {
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return;
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}
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SLKTextView *prepareInvocation = [self.undoManager prepareWithInvocationTarget:self];
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[prepareInvocation setText:self.text];
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[self.undoManager setActionName:description];
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}
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@end
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