SDL_uikitkeyboard extends SDL_uikitview to add keyboard support. It a…

…dds several methods to the SDL_uikitview class for keyboard initialization, showing, and hiding. SDL_uikitkeyboard.m contains the implementation of these methods as well as the implementation of some iPhone specific additions to SDL so that a programmer can access the functionality of hiding and showing the keyboard.
libsdl-org · Jul 29, 2008 · f0a204a · f0a204a
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diff --git a/src/video/uikit/SDL_uikitkeyboard.h b/src/video/uikit/SDL_uikitkeyboard.h
@@ -0,0 +1,47 @@
+/*
+ SDL - Simple DirectMedia Layer
+ Copyright (C) 1997-2006 Sam Lantinga
+ 
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+ 
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+ 
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ 
+ Sam Lantinga
+ slouken@libsdl.org
+ */
+
+#ifndef _SDL_uikitkeyboard_h
+#define _SDL_uikitkeyboard_h
+
+#if SDL_IPHONE_KEYBOARD
+
+#import "SDL_uikitview.h"
+
+@interface SDL_uikitview (keyboardMethods)
+
+- (void)showKeyboard;
+- (void)hideKeyboard;
+- (void)initializeKeyboard;
+
+@property (readonly) BOOL keyboardVisible;
+
+@end
+
+#endif /* SDL_IPHONE_KEYBOARD */
+
+extern DECLSPEC int SDLCALL SDL_iPhoneKeyboardShow(SDL_WindowID windowID);
+extern DECLSPEC int SDLCALL SDL_iPhoneKeyboardHide(SDL_WindowID windowID);
+extern DECLSPEC SDL_bool SDLCALL SDL_iPhoneKeyboardIsShown(SDL_WindowID windowID);
+extern DECLSPEC int SDLCALL SDL_iPhoneKeyboardToggle(SDL_WindowID windowID);
+
+#endif /* _SDL_uikitkeyboard_h */
diff --git a/src/video/uikit/SDL_uikitkeyboard.m b/src/video/uikit/SDL_uikitkeyboard.m
@@ -0,0 +1,263 @@
+/*
+ SDL - Simple DirectMedia Layer
+ Copyright (C) 1997-2006 Sam Lantinga
+ 
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+ 
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+ 
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ 
+ Sam Lantinga
+ slouken@libsdl.org
+ */
+
+#include "SDL_video.h"
+
+#if SDL_IPHONE_KEYBOARD
+
+#import "SDL_uikitkeyboard.h"
+#import "SDL_uikitview.h"
+#import "SDL_keyboard_c.h"
+#import "keyinfotable.h"
+#import "SDL_uikitappdelegate.h"
+#import "SDL_uikitwindow.h"
+
+@implementation  SDL_uikitview (keyboardMethods)
+
+- (BOOL)keyboardVisible {
+	return keyboardVisible;
+}
+
+/* UITextFieldDelegate related methods */
+- (void)initializeKeyboard {
+
+	NSLog(@"Text field init");
+
+	textField = [[UITextField alloc] initWithFrame: CGRectZero];
+	textField.delegate = self;
+	/* placeholder so there is something to delete! */
+	textField.text = @" ";	
+
+	/* set UITextInputTrait properties, mostly to defaults */
+	textField.autocapitalizationType = UITextAutocapitalizationTypeNone;
+	textField.autocorrectionType = UITextAutocorrectionTypeNo;
+	textField.enablesReturnKeyAutomatically = NO;
+	textField.keyboardAppearance = UIKeyboardAppearanceDefault;
+	textField.keyboardType = UIKeyboardTypeDefault;
+	textField.returnKeyType = UIReturnKeyDefault;
+	textField.secureTextEntry = NO;	
+
+	textField.hidden = YES;
+	keyboardVisible = NO;
+	[self addSubview: textField];
+
+	/*
+	 SDL makes a copy of our keyboard.
+	 */
+
+	SDL_Keyboard keyboard;
+	SDL_zero(keyboard);
+	//data->keyboard = SDL_AddKeyboard(&keyboard, -1);
+	/* 
+	 We'll need to delete this keyboard ...
+	 */
+	SDL_AddKeyboard(&keyboard, 0);
+	SDLKey keymap[SDL_NUM_SCANCODES];
+	SDL_GetDefaultKeymap(keymap);
+	SDL_SetKeymap(0, 0, keymap, SDL_NUM_SCANCODES);
+
+}
+
+- (void)showKeyboard {
+	keyboardVisible = YES;
+	[textField becomeFirstResponder];
+}
+
+- (void)hideKeyboard {
+	keyboardVisible = NO;
+	[textField resignFirstResponder];
+}
+
+- (BOOL)textField:(UITextField *)_textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
+
+	if ([string length] == 0) {
+		/* it wants to replace text with nothing, ie a delete */
+		SDL_SendKeyboardKey( 0, SDL_PRESSED, SDL_SCANCODE_DELETE);
+		SDL_SendKeyboardKey( 0, SDL_RELEASED, SDL_SCANCODE_DELETE);
+	}
+	else {
+
+		int i;
+		for (i=0; i<[string length]; i++) {
+
+			unichar c = [string characterAtIndex: i];
+
+			Uint16 mod = 0;
+			SDL_scancode code;
+
+			if (0 <= c && c < 127) {
+				code = unicharToUIKeyInfoTable[c].code;
+				mod  = unicharToUIKeyInfoTable[c].mod;
+			}
+			else {
+				code = SDL_SCANCODE_UNKNOWN;
+				mod = 0;
+			}
+
+			if (mod & KMOD_SHIFT) {
+				SDL_SendKeyboardKey( 0, SDL_PRESSED, SDL_SCANCODE_LSHIFT);
+			}
+			SDL_SendKeyboardKey( 0, SDL_PRESSED, code);
+			SDL_SendKeyboardKey( 0, SDL_RELEASED, code);
+			if (mod & KMOD_SHIFT) {
+				SDL_SendKeyboardKey( 0, SDL_RELEASED, SDL_SCANCODE_LSHIFT);
+			}			
+
+		}
+
+	}
+	return NO; /* don't allow the edit(!) */
+}
+
+/* Terminates the editing session */
+- (BOOL)textFieldShouldReturn:(UITextField*)_textField {
+	[self hideKeyboard];
+	return YES;
+}
+
+@end
+
+/* iPhone keyboard addition functions */
+
+int SDL_iPhoneKeyboardShow(SDL_WindowID windowID) {
+
+	SDL_Window *window = SDL_GetWindowFromID(windowID);
+	SDL_WindowData *data;
+	SDL_uikitview *view;
+
+	if (NULL == window) {
+		SDL_SetError("Window does not exist");
+		return -1;
+	}
+
+	data = (SDL_WindowData *)window->driverdata;
+	view = data->view;
+
+	if (nil == view) {
+		SDL_SetError("Window has no view");
+		return -1;
+	}
+	else {
+		[view showKeyboard];
+		return 0;
+	}
+}
+
+int SDL_iPhoneKeyboardHide(SDL_WindowID windowID) {
+
+	SDL_Window *window = SDL_GetWindowFromID(windowID);
+	SDL_WindowData *data;
+	SDL_uikitview *view;
+
+	if (NULL == window) {
+		SDL_SetError("Window does not exist");
+		return -1;
+	}	
+
+	data = (SDL_WindowData *)window->driverdata;
+	view = data->view;
+
+	if (NULL == view) {
+		SDL_SetError("Window has no view");
+		return -1;
+	}
+	else {
+		[view hideKeyboard];
+		return 0;
+	}
+}
+
+SDL_bool SDL_iPhoneKeyboardIsShown(SDL_WindowID windowID) {
+
+	SDL_Window *window = SDL_GetWindowFromID(windowID);
+	SDL_WindowData *data;
+	SDL_uikitview *view;
+
+	if (NULL == window) {
+		SDL_SetError("Window does not exist");
+		return -1;
+	}	
+
+	data = (SDL_WindowData *)window->driverdata;
+	view = data->view;
+
+	if (NULL == view) {
+		SDL_SetError("Window has no view");
+		return 0;
+	}
+	else {
+		return view.keyboardVisible;
+	}
+}
+
+int SDL_iPhoneKeyboardToggle(SDL_WindowID windowID) {
+
+	SDL_Window *window = SDL_GetWindowFromID(windowID);
+	SDL_WindowData *data;
+	SDL_uikitview *view;
+
+	if (NULL == window) {
+		SDL_SetError("Window does not exist");
+		return -1;
+	}	
+
+	data = (SDL_WindowData *)window->driverdata;
+	view = data->view;
+
+	if (NULL == view) {
+		SDL_SetError("Window has no view");
+		return -1;
+	}
+	else {
+		if (SDL_iPhoneKeyboardIsShown(windowID)) {
+			SDL_iPhoneKeyboardHide(windowID);
+		}
+		else {
+			SDL_iPhoneKeyboardShow(windowID);
+		}
+		return 0;
+	}
+}
+
+#else
+
+int SDL_iPhoneKeyboardShow(SDL_WindowID windowID) {
+	SDL_SetError("Not compiled with keyboard support");
+	return -1;
+}
+
+int SDL_iPhoneKeyboardHide(SDL_WindowID windowID) {
+	SDL_SetError("Not compiled with keyboard support");
+	return -1;
+}
+
+SDL_bool SDL_iPhoneKeyboardIsShown(SDL_WindowID windowID) {
+	return 0;
+}
+
+int SDL_iPhoneKeyboardToggle(SDL_WindowID windowID) {
+	SDL_SetError("Not compiled with keyboard support");
+	return -1;
+}
+
+
+#endif /* SDL_IPHONE_KEYBOARD */