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+/*************************************************************************/
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+/* keyboard_input_view.mm */
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+/*************************************************************************/
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+/* This file is part of: */
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+/* GODOT ENGINE */
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+/* https://godotengine.org */
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+/*************************************************************************/
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+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
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+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
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+/* */
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+/* Permission is hereby granted, free of charge, to any person obtaining */
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+/* a copy of this software and associated documentation files (the */
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+/* "Software"), to deal in the Software without restriction, including */
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+/* without limitation the rights to use, copy, modify, merge, publish, */
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+/* distribute, sublicense, and/or sell copies of the Software, and to */
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+/* permit persons to whom the Software is furnished to do so, subject to */
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+/* the following conditions: */
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+/* */
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+/* The above copyright notice and this permission notice shall be */
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+/* included in all copies or substantial portions of the Software. */
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+/* */
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+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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+/*************************************************************************/
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+
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+#import "keyboard_input_view.h"
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+
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+#include "core/os/keyboard.h"
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+#include "os_iphone.h"
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+
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+@interface GodotKeyboardInputView () <UITextViewDelegate>
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+
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+@property(nonatomic, copy) NSString *previousText;
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+@property(nonatomic, assign) NSRange previousSelectedRange;
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+
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+@end
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+
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+@implementation GodotKeyboardInputView
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+
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+- (instancetype)initWithCoder:(NSCoder *)coder {
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+ self = [super initWithCoder:coder];
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+
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+ if (self) {
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+ [self godot_commonInit];
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+ }
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+
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+ return self;
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+}
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+
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+- (instancetype)initWithFrame:(CGRect)frame textContainer:(NSTextContainer *)textContainer {
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+ self = [super initWithFrame:frame textContainer:textContainer];
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+
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+ if (self) {
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+ [self godot_commonInit];
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+ }
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+
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+ return self;
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+}
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+
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+- (void)godot_commonInit {
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+ self.hidden = YES;
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+ self.delegate = self;
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+
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+ [[NSNotificationCenter defaultCenter] addObserver:self
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+ selector:@selector(observeTextChange:)
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+ name:UITextViewTextDidChangeNotification
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+ object:self];
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+}
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+
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+- (void)dealloc {
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+ self.delegate = nil;
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+ [[NSNotificationCenter defaultCenter] removeObserver:self];
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+}
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+
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+// MARK: Keyboard
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+
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+- (BOOL)canBecomeFirstResponder {
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+ return YES;
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+}
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+
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+- (BOOL)becomeFirstResponderWithString:(NSString *)existingString multiline:(BOOL)flag cursorStart:(NSInteger)start cursorEnd:(NSInteger)end {
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+ self.text = existingString;
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+ self.previousText = existingString;
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+
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+ NSRange textRange;
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+
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+ // Either a simple cursor or a selection.
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+ if (end > 0) {
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+ textRange = NSMakeRange(start, end - start);
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+ } else {
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+ textRange = NSMakeRange(start, 0);
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+ }
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+
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+ self.selectedRange = textRange;
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+ self.previousSelectedRange = textRange;
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+
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+ return [self becomeFirstResponder];
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+}
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+
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+- (BOOL)resignFirstResponder {
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+ self.text = nil;
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+ self.previousText = nil;
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+ return [super resignFirstResponder];
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+}
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+
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+// MARK: OS Messages
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+
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+- (void)deleteText:(NSInteger)charactersToDelete {
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+ for (int i = 0; i < charactersToDelete; i++) {
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+ OSIPhone::get_singleton()->key(KEY_BACKSPACE, true);
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+ OSIPhone::get_singleton()->key(KEY_BACKSPACE, false);
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+ }
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+}
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+
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+- (void)enterText:(NSString *)substring {
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+ String characters;
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+ characters.parse_utf8([substring UTF8String]);
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+
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+ for (int i = 0; i < characters.size(); i++) {
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+ int character = characters[i];
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+
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+ switch (character) {
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+ case 10:
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+ character = KEY_ENTER;
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+ break;
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+ case 8198:
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+ character = KEY_SPACE;
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+ break;
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+ default:
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+ break;
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+ }
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+
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+ OSIPhone::get_singleton()->key(character, true);
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+ OSIPhone::get_singleton()->key(character, false);
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+ }
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+}
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+
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+// MARK: Observer
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+
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+- (void)observeTextChange:(NSNotification *)notification {
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+ if (notification.object != self) {
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+ return;
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+ }
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+
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+ if (self.previousSelectedRange.length == 0) {
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+ // We are deleting all text before cursor if no range was selected.
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+ // This way any inserted or changed text will be updated.
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+ NSString *substringToDelete = [self.previousText substringToIndex:self.previousSelectedRange.location];
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+ [self deleteText:substringToDelete.length];
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+ } else {
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+ // If text was previously selected
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+ // we are sending only one `backspace`.
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+ // It will remove all text from text input.
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+ [self deleteText:1];
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+ }
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+
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+ NSString *substringToEnter;
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+
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+ if (self.selectedRange.length == 0) {
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+ // If previous cursor had a selection
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+ // we have to calculate an inserted text.
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+ if (self.previousSelectedRange.length != 0) {
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+ NSInteger rangeEnd = self.selectedRange.location + self.selectedRange.length;
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+ NSInteger rangeStart = MIN(self.previousSelectedRange.location, self.selectedRange.location);
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+ NSInteger rangeLength = MAX(0, rangeEnd - rangeStart);
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+
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+ NSRange calculatedRange;
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+
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+ if (rangeLength >= 0) {
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+ calculatedRange = NSMakeRange(rangeStart, rangeLength);
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+ } else {
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+ calculatedRange = NSMakeRange(rangeStart, 0);
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+ }
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+
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+ substringToEnter = [self.text substringWithRange:calculatedRange];
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+ } else {
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+ substringToEnter = [self.text substringToIndex:self.selectedRange.location];
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+ }
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+ } else {
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+ substringToEnter = [self.text substringWithRange:self.selectedRange];
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+ }
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+
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+ [self enterText:substringToEnter];
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+
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+ self.previousText = self.text;
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+ self.previousSelectedRange = self.selectedRange;
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+}
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+
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+@end
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Rémi Verschelde