aboutsummaryrefslogtreecommitdiffstats
path: root/src/gwin/gwin_textedit.c
blob: 3373ab34f58221d96dcabbeeb1c8e34ebb4a6277 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
/*
 * This file is subject to the terms of the GFX License. If a copy of
 * the license was not distributed with this file, you can obtain one at:
 *
 *              http://ugfx.org/license.html
 */

/**
 * @file	src/gwin/gwin_textedit.c
 * @brief	GWIN TextEdit widget header file
 */

#include "../../gfx.h"

#if GFX_USE_GWIN && GWIN_NEED_TEXTEDIT

#include "gwin_class.h"
#include <string.h>

// Some settings
#define TEXT_PADDING_LEFT		4
#define CURSOR_PADDING_LEFT		0
#define CURSOR_EXTRA_HEIGHT		1

// Macros to assist in data type conversions
#define gh2obj ((GTexteditObject *)gh)
#define gw2obj ((GTexteditObject *)gw)

static void TextEditRemoveChar(GHandle gh) {
	char		*p;
	const char	*q;
	unsigned	sz;
	unsigned	pos;

	sz = strlen(gh2obj->w.text);
	pos = gh2obj->cursorPos;
	q = gh2obj->w.text+pos;
	
	if (!(gh->flags & GWIN_FLG_ALLOCTXT)) {
		// Allocate and then copy
		if (!(p = gfxAlloc(sz)))
			return;
		if (pos)
			memcpy(p, gh2obj->w.text, pos);
		memcpy(p+pos, q+1, sz-pos);
		gh->flags |= GWIN_FLG_ALLOCTXT;
	} else {
		// Copy and then reallocate
		memcpy((char *)q, q+1, sz-pos);
		if (!(p = gfxRealloc((char *)gh2obj->w.text, sz+1, sz)))		// This should never fail as we are making it smaller
			return;
	}
	gh2obj->w.text = p;
}

static gBool TextEditAddChars(GHandle gh, unsigned cnt) {
	char		*p;
	const char	*q;
	unsigned	sz;
	unsigned	pos;

	// Get the size of the text buffer
	sz = strlen(gh2obj->w.text)+1;
	pos = gh2obj->cursorPos;

	if (!(gh->flags & GWIN_FLG_ALLOCTXT)) {
		if (!(p = gfxAlloc(sz+cnt)))
			return gFalse;
		memcpy(p, gh2obj->w.text, pos);
		memcpy(p+pos+cnt, gh2obj->w.text+pos, sz-pos);
		gh->flags |= GWIN_FLG_ALLOCTXT;
		gh2obj->w.text = p;
	} else {
		if (!(p = gfxRealloc((char *)gh2obj->w.text, sz, sz+cnt)))
			return gFalse;
		gh2obj->w.text = p;
		q = p+pos;
		p += sz;
		while(--p >= q)
			p[cnt] = p[0];
	}
	return gTrue;
}

// Function that allows to set the cursor to any position in the string
// This should be optimized. Currently it is an O(n^2) problem and therefore very
// slow. An optimized version would copy the behavior of mf_get_string_width()
// and do the comparation directly inside of that loop so we only iterate
// the string once.
static void TextEditMouseDown(GWidgetObject* gw, gCoord x, gCoord y) {
	uint16_t i = 0;

	(void)y;

	// Directly jump to the end of the string
	if (x > gdispGetStringWidth(gw->text, gw->g.font)) {
		gw2obj->cursorPos = strlen(gw->text);

	// Otherwise iterate through each character and get the size in pixels to compare
	} else {
		i = 1;
		while (gdispGetStringWidthCount(gw->text, gw->g.font, i) < x) {
			i++;
		}

		gw2obj->cursorPos = i-1;
	}

	_gwinUpdate((GHandle)gw);
}

#if (GFX_USE_GINPUT && GINPUT_NEED_KEYBOARD) || GWIN_NEED_KEYBOARD
	static void TextEditKeyboard(GWidgetObject* gw, GEventKeyboard* pke) {
		// Only react on KEYDOWN events. Ignore KEYUP events.
		if ((pke->keystate & GKEYSTATE_KEYUP) || !pke->bytecount)
			return;

		// Is it a special key?
		if (pke->keystate & GKEYSTATE_SPECIAL) {
			// Arrow keys to move the cursor
			gwinTextEditSendSpecialKey(&gw->g, (uint8_t)pke->c[0]);
			return;

		}

		gwinTextEditSendKey(&gw->g, pke->c, pke->bytecount);
	}
#endif

static const gwidgetVMT texteditVMT = {
	{
		"TextEdit",					// The class name
		sizeof(GTexteditObject),	// The object size
		_gwidgetDestroy,			// The destroy routine
		_gwidgetRedraw, 			// The redraw routine
		0,							// The after-clear routine
	},
	gwinTexteditDefaultDraw,		// default drawing routine
	#if GINPUT_NEED_MOUSE
		{
			TextEditMouseDown,		// Process mouse down events (NOT USED)
			0,						// Process mouse up events (NOT USED)
			0,						// Process mouse move events (NOT USED)
		},
	#endif
	#if (GFX_USE_GINPUT && GINPUT_NEED_KEYBOARD) || GWIN_NEED_KEYBOARD
		{
			TextEditKeyboard		// Process keyboard key down events
		},
	#endif
	#if GINPUT_NEED_TOGGLE
		{
			0,						// No toggle role
			0,						// Assign Toggles (NOT USED)
			0,						// Get Toggles (NOT USED)
			0,						// Process toggle off event (NOT USED)
			0,						// Process toggle on event (NOT USED)
		},
	#endif
	#if GINPUT_NEED_DIAL
		{
			0,						// No dial roles
			0,						// Assign Dials (NOT USED)
			0, 						// Get Dials (NOT USED)
			0,						// Procees dial move events (NOT USED)
		},
	#endif
};

GHandle gwinGTexteditCreate(GDisplay* g, GTexteditObject* wt, GWidgetInit* pInit, size_t maxSize)
{
	// Create the underlying widget
	if (!(wt = (GTexteditObject*)_gwidgetCreate(g, &wt->w, pInit, &texteditVMT)))
		return 0;

	wt->maxSize = maxSize;

	// Set cursor position
	wt->cursorPos = strlen(wt->w.text);

	gwinSetVisible(&wt->w.g, pInit->g.show);

	return (GHandle)wt;
}

#if (GFX_USE_GINPUT && GINPUT_NEED_KEYBOARD) || GWIN_NEED_KEYBOARD
	void gwinTextEditSendSpecialKey(GHandle gh, uint8_t key) {
		// Is it a valid handle?
		if (gh->vmt != (gwinVMT*)&texteditVMT)
			return;

		// Arrow keys to move the cursor
		switch (key) {
		case GKEY_LEFT:
			if (!gh2obj->cursorPos)
				return;
			gh2obj->cursorPos--;
			break;
		case GKEY_RIGHT:
			if (!gh2obj->w.text[gh2obj->cursorPos])
				return;
			gh2obj->cursorPos++;
			break;
		case GKEY_HOME:
			if (!gh2obj->cursorPos)
				return;
			gh2obj->cursorPos = 0;
			break;
		case GKEY_END:
			if (!gh2obj->w.text[gh2obj->cursorPos])
				return;
			gh2obj->cursorPos = strlen(gh2obj->w.text);
			break;
		default:
			return;
		}

		_gwinUpdate(gh);
	}

	void gwinTextEditSendKey(GHandle gh, char *key, unsigned len) {
		// Is it a valid handle?
		if (gh->vmt != (gwinVMT*)&texteditVMT || !key || !len)
			return;

		// Normal key press
		switch((uint8_t)key[0]) {
		case GKEY_BACKSPACE:
			// Backspace
			if (!gh2obj->cursorPos)
				return;
			gh2obj->cursorPos--;
			TextEditRemoveChar(gh);
			break;
		case GKEY_TAB:
		case GKEY_LF:
		case GKEY_CR:
			// Move to the next field
			_gwinMoveFocus();
			return;
		case GKEY_DEL:
			// Delete
			if (!gh2obj->w.text[gh2obj->cursorPos])
				return;
			TextEditRemoveChar(gh);
			break;
		default:
			// Ignore any other control characters
			if ((uint8_t)key[0] < GKEY_SPACE)
				return;

			// Keep the edit length to less than the maximum
			if (gh2obj->maxSize && strlen(gh2obj->w.text)+len > gh2obj->maxSize)
				return;

			// Make space
			if (TextEditAddChars(gh, len)) {
				// Insert the characters
				memcpy((char *)gh2obj->w.text+gh2obj->cursorPos, key, len);
				gh2obj->cursorPos += len;
			}
			break;
		}

		_gwinUpdate(gh);
	}
#endif

void gwinTexteditDefaultDraw(GWidgetObject* gw, void* param)
{
	const char*			p;
	gCoord				cpos, tpos;
	const GColorSet*	pcol;

	(void)param;

	// Is it a valid handle?
	if (gw->g.vmt != (gwinVMT*)&texteditVMT)
		return;

	// Retrieve colors
	if ((gw->g.flags & GWIN_FLG_SYSENABLED))
		pcol = &gw->pstyle->enabled;
	else
		pcol = &gw->pstyle->disabled;

	// Adjust the text position so the cursor fits in the window
	p = gw->text;
	if (!gw2obj->cursorPos)
		tpos = 0;
	else {
		for(cpos = gw2obj->cursorPos; ; p++, cpos--) {
			tpos = gdispGetStringWidthCount(p, gw->g.font, cpos);
			if (tpos < gw->g.width-(TEXT_PADDING_LEFT+CURSOR_PADDING_LEFT))
				break;
		}
	}

	// Render background and string
	#if TEXT_PADDING_LEFT
		gdispGFillArea(gw->g.display, gw->g.x, gw->g.y, TEXT_PADDING_LEFT, gw->g.height, pcol->fill);
	#endif
	gdispGFillStringBox(gw->g.display, gw->g.x + TEXT_PADDING_LEFT, gw->g.y, gw->g.width-TEXT_PADDING_LEFT, gw->g.height, p, gw->g.font, pcol->text, pcol->fill, gJustifyLeft);

	// Render cursor (if focused)
	if (gwinGetFocus() == (GHandle)gw) {
		// Calculate cursor stuff

		// Draw cursor
		tpos += gw->g.x + CURSOR_PADDING_LEFT + TEXT_PADDING_LEFT + gdispGetFontMetric(gw->g.font, gFontBaselineX)/2;
		cpos = (gw->g.height - gdispGetFontMetric(gw->g.font, gFontHeight))/2 - CURSOR_EXTRA_HEIGHT;
		gdispGDrawLine(gw->g.display, tpos, gw->g.y + cpos, tpos, gw->g.y + gw->g.height - cpos, pcol->edge);
	}

	// Render border
	gdispGDrawBox(gw->g.display, gw->g.x, gw->g.y, gw->g.width, gw->g.height, pcol->edge);

	// Render highlighted border if focused
	_gwidgetDrawFocusRect(gw, 0, 0, gw->g.width, gw->g.height);

}

#undef gh2obj
#undef gw2obj

#endif // GFX_USE_GWIN && GWIN_NEED_TEXTEDIT