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#ifndef KEYBOARD_INC_C
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#define KEYBOARD_INC_C
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struct Keyboard;
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typedef struct Key {
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int x, y, w, h;
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const char *label;
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struct Keyboard *kbd;
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int lx, ly;
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int pressed;
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} Key;
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typedef struct Keyboard {
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Key *keys;
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int keysCount;
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Display* dpy;
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Window win;
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GC gc;
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GContext gcid;
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XFontStruct *font;
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Key *keyMousePressed;
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} Keyboard;
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void keyInit(Key *k, Keyboard *kbd) {
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k->pressed = 0;
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k->kbd = kbd;
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XFontStruct *font = XQueryFont(k->kbd->dpy, k->kbd->gcid);
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XRectangle r = {};
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XTextExtents(font, k->label, strlen(k->label), NULL, &r);
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k->lx = k->x + (k->w - r.width)/2 - r.x;
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k->ly = k->y + (k->h - r.height)/2 - r.y;
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}
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void keyDeinit(Key *k) {
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k->pressed = 0;
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}
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void keyDraw(Key *k, int cx, int cy, int cw, int ch) {
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if ( k->x + k->w <= cx || k->x >= cx + cw
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|| k->y + k->h <= cy || k->y >= cy + ch ) return;
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if (k->pressed)
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XDrawRectangle(k->kbd->dpy, k->kbd->win, k->kbd->gc, k->x, k->y, k->w, k->h);
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XDrawString(k->kbd->dpy, k->kbd->win);
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}
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void keyMouseDown(Key *k) {
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k->pressed = 1;
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}
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void keyMouseUp(Key *k) {
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k->pressed = 0;
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}
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void keyboardInit(Keyboard *kbd, Display *dpy, Window win) {
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kbd->keyMousePressed = NULL;
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kbd->dpy = dpy;
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kbd->win = win;
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kbd->gc = DefaultGC(kbd->dpy, kbd->win);
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kbd->gcid = XGContextFromGC(kbd->gc);
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kbd->font = XQueryFont(k->kbd->dpy, k->kbd->gcid);
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for(int i = 0; i < kbd->keysCount; ++i)
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keyInit(&kbd->keys[i], kbd);
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}
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void keyboardDeinit(Keyboard *kbd) {
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for(int i = 0; i < kbd->keysCount; ++i)
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keyDeinit(kbd->keys[i]);
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kbd->keyMousePressed = NULL;
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kbd->font = XFreeFont(kbd->dpy, kbd->font);
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kbd->gcid = NULL;
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kbd->gc = NULL;
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kbd->win = NULL;
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kbd->dpy = NULL;
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}
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void keyboardDraw(Keyboard *kbd, int cx, int cy, int cw, int ch) {
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for(int i = 0; i < kbd->keysCount; ++i)
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keyDraw(&kbd->keys[i], cx, cy, cw, ch);
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}
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void keyboardMouseDown(Keyboard *kbd, int x, int y) {
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for(int i = kbd->keysCount - 1; i >= 0; --i) {
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Key *k = &kbd->keys[i];
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if ( k->x <= x && x < k->x + k->w
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&& k->y <= y && y < k->y + k->h )
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{
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if (kbd->keyMousePressed != k) {
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keyboardMouseUp(kbd);
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kbd->keyMousePressed = k;
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keyMouseDown(k);
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}
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break;
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}
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}
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}
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void keyboardMouseUp(Keyboard *kbd) {
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if (kbd->keyMousePressed) {
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kbd->keyMouseUp(kbd->keyMousePressed);
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kbd->keyMousePressed = NULL;
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}
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}
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#endif
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