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ugfx/src/gwin/gwin_textedit.c

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/*
* 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.io/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;
if (pos > sz)
pos = gh2obj->cursorPos = sz;
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 (pos >= sz)
pos = gh2obj->cursorPos = sz-1;
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) {
gU16 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, (gU8)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, gMemSize 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, gU8 key) {
unsigned sz;
// Is it a valid handle?
if (gh->vmt != (gwinVMT*)&texteditVMT)
return;
// Check that cursor position is within buffer (in case text has been changed)
sz = strlen(gh2obj->w.text);
if (gh2obj->cursorPos > sz)
gh2obj->cursorPos = sz;
// 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 = sz;
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((gU8)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 ((gU8)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
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