simple titlebars; split source up
This commit is contained in:
seanpringle
374
textbox.c
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374
textbox.c
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/*
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MIT/X11 License
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Copyright (c) 2012 Sean Pringle <sean.pringle@gmail.com>
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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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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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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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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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#define TB_AUTOHEIGHT 1<<0
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#define TB_AUTOWIDTH 1<<1
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#define TB_LEFT 1<<16
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#define TB_RIGHT 1<<17
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#define TB_CENTER 1<<18
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#define TB_EDITABLE 1<<19
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typedef struct {
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unsigned long flags;
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Window window, parent;
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short x, y, w, h;
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short cursor;
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XftFont *font;
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XftColor color_fg, color_bg;
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char *text, *prompt;
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XIM xim;
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XIC xic;
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XGlyphInfo extents;
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} textbox;
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void textbox_font(textbox *tb, char *font, char *fg, char *bg);
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void textbox_text(textbox *tb, char *text);
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void textbox_moveresize(textbox *tb, int x, int y, int w, int h);
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// Xft text box, optionally editable
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textbox* textbox_create(Window parent, unsigned long flags, short x, short y, short w, short h, char *font, char *fg, char *bg, char *text, char *prompt)
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{
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textbox *tb = calloc(1, sizeof(textbox));
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tb->flags = flags;
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tb->parent = parent;
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tb->x = x; tb->y = y; tb->w = MAX(1, w); tb->h = MAX(1, h);
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XColor color; Colormap map = DefaultColormap(display, DefaultScreen(display));
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unsigned int cp = XAllocNamedColor(display, map, bg, &color, &color) ? color.pixel: None;
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tb->window = XCreateSimpleWindow(display, tb->parent, tb->x, tb->y, tb->w, tb->h, 0, None, cp);
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// need to preload the font to calc line height
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textbox_font(tb, font, fg, bg);
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tb->prompt = strdup(prompt ? prompt: "");
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textbox_text(tb, text ? text: "");
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// auto height/width modes get handled here
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textbox_moveresize(tb, tb->x, tb->y, tb->w, tb->h);
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// edit mode controls
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if (tb->flags & TB_EDITABLE)
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{
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tb->xim = XOpenIM(display, NULL, NULL, NULL);
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tb->xic = XCreateIC(tb->xim, XNInputStyle, XIMPreeditNothing | XIMStatusNothing, XNClientWindow, tb->window, XNFocusWindow, tb->window, NULL);
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}
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return tb;
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}
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// set an Xft font by name
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void textbox_font(textbox *tb, char *font, char *fg, char *bg)
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{
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if (tb->font) XftFontClose(display, tb->font);
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tb->font = XftFontOpenName(display, DefaultScreen(display), font);
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XftColorAllocName(display, DefaultVisual(display, DefaultScreen(display)), DefaultColormap(display, DefaultScreen(display)), fg, &tb->color_fg);
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XftColorAllocName(display, DefaultVisual(display, DefaultScreen(display)), DefaultColormap(display, DefaultScreen(display)), bg, &tb->color_bg);
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}
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// outer code may need line height, width, etc
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void textbox_extents(textbox *tb)
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{
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int length = strlen(tb->text) + strlen(tb->prompt);
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char *line = alloca(length + 1);
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sprintf(line, "%s%s", tb->prompt, tb->text);
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XftTextExtents8(display, tb->font, (unsigned char*)line, length, &tb->extents);
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}
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// set the default text to display
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void textbox_text(textbox *tb, char *text)
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{
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if (tb->text) free(tb->text);
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tb->text = strdup(text ? text: "");
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tb->cursor = MAX(0, MIN(strlen(tb->text), tb->cursor));
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textbox_extents(tb);
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}
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// set an input prompt for edit mode
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void textbox_prompt(textbox *tb, char *text)
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{
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if (tb->prompt) free(tb->prompt);
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tb->prompt = strdup(text);
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textbox_extents(tb);
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}
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// within the parent. handled auto width/height modes
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void textbox_moveresize(textbox *tb, int x, int y, int w, int h)
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{
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if (tb->flags & TB_AUTOHEIGHT)
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h = tb->font->ascent + tb->font->descent;
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if (tb->flags & TB_AUTOWIDTH)
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w = tb->extents.width;
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if (x != tb->x || y != tb->y || w != tb->w || h != tb->h)
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{
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tb->x = x; tb->y = y; tb->w = MAX(1, w); tb->h = MAX(1, h);
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XMoveResizeWindow(display, tb->window, tb->x, tb->y, tb->w, tb->h);
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}
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}
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void textbox_show(textbox *tb)
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{
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XMapWindow(display, tb->window);
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}
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void textbox_hide(textbox *tb)
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{
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XUnmapWindow(display, tb->window);
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}
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// will also unmap the window if still displayed
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void textbox_free(textbox *tb)
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{
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if (tb->flags & TB_EDITABLE)
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{
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XDestroyIC(tb->xic);
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XCloseIM(tb->xim);
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}
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if (tb->text) free(tb->text);
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if (tb->prompt) free(tb->prompt);
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if (tb->font) XftFontClose(display, tb->font);
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XDestroyWindow(display, tb->window);
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free(tb);
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}
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void textbox_draw(textbox *tb)
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{
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int i;
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XGlyphInfo extents;
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GC context = XCreateGC(display, tb->window, 0, 0);
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Pixmap canvas = XCreatePixmap(display, tb->window, tb->w, tb->h, DefaultDepth(display, DefaultScreen(display)));
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XftDraw *draw = XftDrawCreate(display, canvas, DefaultVisual(display, DefaultScreen(display)), DefaultColormap(display, DefaultScreen(display)));
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// clear canvas
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XftDrawRect(draw, &tb->color_bg, 0, 0, tb->w, tb->h);
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char *line = tb->text,
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*text = tb->text ? tb->text: "",
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*prompt = tb->prompt ? tb->prompt: "";
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int text_len = strlen(text);
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int length = text_len;
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int line_height = tb->font->ascent + tb->font->descent;
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int line_width = 0;
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int cursor_x = 0;
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int cursor_offset = 0;
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int cursor_width = MAX(2, line_height/10);
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if (tb->flags & TB_EDITABLE)
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{
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int prompt_len = strlen(prompt);
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length = text_len + prompt_len;
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cursor_offset = MIN(tb->cursor + prompt_len, length);
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line = alloca(length + 10);
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sprintf(line, "%s%s", prompt, text);
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// replace spaces so XftTextExtents8 includes their width
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for (i = 0; i < length; i++) if (isspace(line[i])) line[i] = '_';
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// calc cursor position
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XftTextExtents8(display, tb->font, (unsigned char*)line, cursor_offset, &extents);
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cursor_x = extents.width;
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// restore correct text string with spaces
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sprintf(line, "%s%s", prompt, text);
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}
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// calc full input text width
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XftTextExtents8(display, tb->font, (unsigned char*)line, length, &extents);
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line_width = extents.width;
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int x = 0, y = tb->font->ascent;
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if (tb->flags & TB_RIGHT) x = tb->w - line_width;
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if (tb->flags & TB_CENTER) x = MAX(0, (tb->w - line_width) / 2);
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// draw the text, including any prompt in edit mode
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XftDrawString8(draw, &tb->color_fg, tb->font, x, y, (unsigned char*)line, length);
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// draw the cursor
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if (tb->flags & TB_EDITABLE)
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XftDrawRect(draw, &tb->color_fg, cursor_x, 2, cursor_width, line_height-4);
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// flip canvas to window
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XCopyArea(display, canvas, tb->window, context, 0, 0, tb->w, tb->h, 0, 0);
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XFreeGC(display, context);
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XftDrawDestroy(draw);
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XFreePixmap(display, canvas);
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}
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// cursor handling for edit mode
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void textbox_cursor(textbox *tb, int pos)
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{
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tb->cursor = MAX(0, MIN(strlen(tb->text), pos));
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}
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// move right
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void textbox_cursor_inc(textbox *tb)
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{
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textbox_cursor(tb, tb->cursor+1);
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}
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// move left
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void textbox_cursor_dec(textbox *tb)
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{
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textbox_cursor(tb, tb->cursor-1);
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}
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// beginning of line
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void textbox_cursor_home(textbox *tb)
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{
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tb->cursor = 0;
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}
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// end of line
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void textbox_cursor_end(textbox *tb)
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{
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tb->cursor = strlen(tb->text);
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}
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// insert text
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void textbox_insert(textbox *tb, int pos, char *str)
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{
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int len = strlen(tb->text), slen = strlen(str);
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pos = MAX(0, MIN(len, pos));
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// expand buffer
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tb->text = realloc(tb->text, len + slen + 1);
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// move everything after cursor upward
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char *at = tb->text + pos;
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memmove(at + slen, at, len - pos + 1);
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// insert new str
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memmove(at, str, slen);
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textbox_extents(tb);
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}
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// remove text
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void textbox_delete(textbox *tb, int pos, int dlen)
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{
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int len = strlen(tb->text);
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pos = MAX(0, MIN(len, pos));
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// move everything after pos+dlen down
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char *at = tb->text + pos;
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memmove(at, at + dlen, len - pos);
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textbox_extents(tb);
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}
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// insert one character
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void textbox_cursor_ins(textbox *tb, char c)
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{
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char tmp[2] = { c, 0 };
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textbox_insert(tb, tb->cursor, tmp);
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textbox_cursor_inc(tb);
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}
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// delete on character
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void textbox_cursor_del(textbox *tb)
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{
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textbox_delete(tb, tb->cursor, 1);
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}
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// back up and delete one character
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void textbox_cursor_bkspc(textbox *tb)
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{
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if (tb->cursor > 0)
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{
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textbox_cursor_dec(tb);
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textbox_cursor_del(tb);
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}
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}
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// handle a keypress in edit mode
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// 0 = unhandled
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// 1 = handled
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// -1 = handled and return pressed (finished)
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int textbox_keypress(textbox *tb, XEvent *ev)
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{
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KeySym key; Status stat;
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char pad[32]; int len;
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if (!(tb->flags & TB_EDITABLE)) return 0;
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len = XmbLookupString(tb->xic, &ev->xkey, pad, sizeof(pad), &key, &stat);
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pad[len] = 0;
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if (key == XK_Left)
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{
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textbox_cursor_dec(tb);
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return 1;
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}
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else
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if (key == XK_Right)
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{
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textbox_cursor_inc(tb);
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return 1;
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}
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else
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if (key == XK_Home)
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{
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textbox_cursor_home(tb);
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return 1;
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}
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else
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if (key == XK_End)
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{
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textbox_cursor_end(tb);
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return 1;
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}
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else
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if (key == XK_Delete)
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{
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textbox_cursor_del(tb);
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return 1;
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}
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else
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if (key == XK_BackSpace)
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{
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textbox_cursor_bkspc(tb);
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return 1;
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}
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else
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if (key == XK_Return)
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{
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return -1;
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}
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else
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if (!iscntrl(*pad))
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{
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textbox_insert(tb, tb->cursor, pad);
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textbox_cursor_inc(tb);
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return 1;
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}
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return 0;
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}
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