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66 lines
2.1 KiB
Objective-C
66 lines
2.1 KiB
Objective-C
//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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#import "OWSMessageTextView.h"
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NS_ASSUME_NONNULL_BEGIN
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@implementation OWSMessageTextView
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// Our message text views are never used for editing;
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// suppress their ability to become first responder
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// so that tapping on them doesn't hide keyboard.
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- (BOOL)canBecomeFirstResponder
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{
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return NO;
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}
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// Ignore interactions with the text view _except_ taps on links.
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//
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// We want to disable "partial" selection of text in the message
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// and we want to enable "tap to resend" by tapping on a message.
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- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *_Nullable)event
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{
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if (self.shouldIgnoreEvents) {
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// We ignore all events for failed messages so that users
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// can tap-to-resend even "all link" messages.
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return NO;
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}
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// Find the nearest text position to the event.
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UITextPosition *_Nullable position = [self closestPositionToPoint:point];
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if (!position) {
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return NO;
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}
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// Find the range of the character in the text which contains the event.
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//
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// Try every layout direction (this might not be necessary).
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UITextRange *_Nullable range = nil;
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for (NSNumber *textLayoutDirection in @[
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@(UITextLayoutDirectionLeft),
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@(UITextLayoutDirectionRight),
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@(UITextLayoutDirectionUp),
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@(UITextLayoutDirectionDown),
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]) {
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range = [self.tokenizer rangeEnclosingPosition:position
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withGranularity:UITextGranularityCharacter
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inDirection:(UITextDirection)textLayoutDirection.intValue];
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if (range) {
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break;
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}
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}
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if (!range) {
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return NO;
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}
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// Ignore the event unless it occurred inside a link.
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NSInteger startIndex = [self offsetFromPosition:self.beginningOfDocument toPosition:range.start];
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BOOL result =
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[self.attributedText attribute:NSLinkAttributeName atIndex:(NSUInteger)startIndex effectiveRange:nil] != nil;
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return result;
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}
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@end
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NS_ASSUME_NONNULL_END
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