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- /*
- * gui_util.c - GUI helper functions
- *
- * Written 2009, 2010 by Werner Almesberger
- * Copyright 2009, 2010 by Werner Almesberger
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- */
- #include <stdlib.h>
- #include <math.h>
- #include <gtk/gtk.h>
- #include "util.h"
- #include "gui_style.h"
- #include "gui.h"
- #include "gui_util.h"
- struct draw_ctx draw_ctx;
- /* ----- look up a color --------------------------------------------------- */
- GdkColor get_color(const char *spec)
- {
- GdkColormap *cmap;
- GdkColor color;
- cmap = gdk_drawable_get_colormap(root->window);
- if (!gdk_color_parse(spec, &color))
- abort();
- if (!gdk_colormap_alloc_color(cmap, &color, FALSE, TRUE))
- abort();
- return color;
- }
- /* ----- lines with a width ------------------------------------------------ */
- void set_width(GdkGC *gc, int width)
- {
- gdk_gc_set_line_attributes(gc, width < 1 ? 1 : width,
- GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND);
- }
- /* ----- backing store ----------------------------------------------------- */
- void free_pix_buf(struct pix_buf *buf)
- {
- g_object_unref(G_OBJECT(buf->buf));
- free(buf);
- }
- struct pix_buf *save_pix_buf(GdkDrawable *da, int xa, int ya, int xb, int yb,
- int border)
- {
- struct pix_buf *buf;
- int w, h;
- if (xa > xb)
- SWAP(xa, xb);
- if (ya > yb)
- SWAP(ya, yb);
- buf = alloc_type(struct pix_buf);
- buf->da = da;
- buf->x = xa-border;
- buf->y = ya-border;
- w = xb-xa+1+2*border;
- h = yb-ya+1+2*border;
- if (buf->x < 0) {
- w += buf->x;
- buf->x = 0;
- }
- if (buf->y < 0) {
- h += buf->y;
- buf->y = 0;
- }
- buf->buf = gdk_pixbuf_get_from_drawable(NULL, da, NULL,
- buf->x, buf->y, 0, 0, w, h);
- return buf;
- }
- void restore_pix_buf(struct pix_buf *buf)
- {
- gdk_draw_pixbuf(buf->da, NULL, buf->buf, 0, 0, buf->x, buf->y, -1, -1,
- GDK_RGB_DITHER_NORMAL, 0, 0);
- free_pix_buf(buf);
- }
- /* ----- arcs and circles -------------------------------------------------- */
- void draw_arc(GdkDrawable *da, GdkGC *gc, int fill,
- int x, int y, int r, double a1, double a2)
- {
- /*
- * This adjustment handles two distinct cases:
- * - if a1 == a2, we make sure we draw a full circle
- * - the end angle a2 must always be greater than the start angle a1
- */
- if (a2 <= a1)
- a2 += 360;
- gdk_draw_arc(da, gc, fill, x-r, y-r, 2*r, 2*r, a1*64, (a2-a1)*64);
- }
- void draw_circle(GdkDrawable *da, GdkGC *gc, int fill,
- int x, int y, int r)
- {
- draw_arc(da, gc, fill, x, y, r, 0, 360);
- }
- /* ----- labels in a box --------------------------------------------------- */
- GtkWidget *label_in_box_new(const char *s, const char *tooltip)
- {
- GtkWidget *evbox, *label;
- evbox = gtk_event_box_new();
- label = gtk_label_new(s);
- gtk_misc_set_padding(GTK_MISC(label), 1, 1);
- gtk_container_add(GTK_CONTAINER(evbox), label);
- if (tooltip)
- gtk_widget_set_tooltip_markup(evbox, tooltip);
- return label;
- }
- GtkWidget *box_of_label(GtkWidget *label)
- {
- return gtk_widget_get_ancestor(label, GTK_TYPE_EVENT_BOX);
- }
- void label_in_box_fg(GtkWidget *label, const char *color)
- {
- GdkColor col = get_color(color);
- gtk_widget_modify_fg(label, GTK_STATE_NORMAL, &col);
- }
- void label_in_box_bg(GtkWidget *label, const char *color)
- {
- GtkWidget *box;
- GdkColor col = get_color(color);
- box = box_of_label(label);
- gtk_widget_modify_bg(box, GTK_STATE_NORMAL, &col);
- }
- /* ----- generate a tool button with an XPM image -------------------------- */
- GtkWidget *make_image(GdkDrawable *drawable, char **xpm, const char *tooltip)
- {
- GdkPixmap *pixmap;
- GtkWidget *image;
- GdkColor white = get_color("white");
- pixmap = gdk_pixmap_create_from_xpm_d(drawable, NULL, &white, xpm);
- image = gtk_image_new_from_pixmap(pixmap, NULL);
- gtk_misc_set_padding(GTK_MISC(image), 1, 1);
- if (tooltip)
- gtk_widget_set_tooltip_markup(image, tooltip);
- return image;
- }
- GtkWidget *make_transparent_image(GdkDrawable *drawable, char **xpm,
- const char *tooltip)
- {
- GdkPixmap *pixmap;
- GdkBitmap *mask;
- GtkWidget *image;
- pixmap = gdk_pixmap_create_from_xpm_d(drawable, &mask, NULL, xpm);
- image = gtk_image_new_from_pixmap(pixmap, mask);
- gtk_misc_set_padding(GTK_MISC(image), 1, 1);
- if (tooltip)
- gtk_widget_set_tooltip_markup(image, tooltip);
- return image;
- }
- static void remove_child(GtkWidget *widget, gpointer data)
- {
- gtk_container_remove(GTK_CONTAINER(data), widget);
- }
- void vacate_widget(GtkWidget *widget)
- {
- gtk_container_foreach(GTK_CONTAINER(widget), remove_child, widget);
- }
- void set_image(GtkWidget *widget, GtkWidget *image)
- {
- vacate_widget(widget);
- gtk_container_add(GTK_CONTAINER(widget), image);
- gtk_widget_show_all(widget);
- }
- GtkWidget *tool_button(GtkWidget *bar, GdkDrawable *drawable,
- char **xpm, const char *tooltip,
- gboolean (*cb)(GtkWidget *widget, GdkEventButton *event, gpointer data),
- gpointer data)
- {
- GtkWidget *image, *evbox;
- GtkToolItem *item;
- /*
- * gtk_radio_tool_button_new_from_widget is *huge*. We try to do things
- * in a
- * more compact way.
- */
- evbox = gtk_event_box_new();
- if (xpm) {
- image = make_image(drawable, xpm, tooltip);
- gtk_container_add(GTK_CONTAINER(evbox), image);
- }
- g_signal_connect(G_OBJECT(evbox), "button_press_event",
- G_CALLBACK(cb), data);
- item = gtk_tool_item_new();
- gtk_container_add(GTK_CONTAINER(item), evbox);
- gtk_container_set_border_width(GTK_CONTAINER(item), 0);
- gtk_toolbar_insert(GTK_TOOLBAR(bar), item, -1);
- return evbox;
- }
- /* ----- render a text string ---------------------------------------------- */
- void render_text(GdkDrawable *da, GdkGC *gc, int x, int y, double angle,
- const char *s, const char *font, double xalign, double yalign,
- int xmax, int ymax)
- {
- GdkScreen *screen;
- PangoRenderer *renderer;
- PangoContext *context;
- PangoLayout *layout;
- PangoFontDescription *desc;
- int width, height;
- PangoMatrix m = PANGO_MATRIX_INIT;
- double f_min, f;
- /* set up the renderer */
- screen = gdk_drawable_get_screen(da);
- renderer = gdk_pango_renderer_get_default(screen);
- gdk_pango_renderer_set_drawable(GDK_PANGO_RENDERER(renderer), da);
- gdk_pango_renderer_set_gc(GDK_PANGO_RENDERER(renderer), gc);
- /* start preparing the layout */
- context = gdk_pango_context_get_for_screen(screen);
- layout = pango_layout_new(context);
- pango_layout_set_text(layout, s, -1);
- /* apply the font */
- desc = pango_font_description_from_string(font);
- pango_layout_set_font_description(layout, desc);
- pango_font_description_free(desc);
- /* align and position the text */
- pango_layout_get_size(layout, &width, &height);
- f_min = 1.0;
- if (xmax) {
- f = xmax/((double) width/PANGO_SCALE);
- if (f < f_min)
- f_min = f;
- }
- if (ymax) {
- f = ymax/((double) height/PANGO_SCALE);
- if (f < f_min)
- f_min = f;
- }
- if (f_min < MIN_FONT_SCALE)
- f_min = MIN_FONT_SCALE;
- pango_matrix_translate(&m, x, y);
- pango_matrix_rotate(&m, angle);
- pango_matrix_translate(&m,
- -xalign*f_min*width/PANGO_SCALE,
- (yalign-1)*f_min*height/PANGO_SCALE);
- pango_matrix_scale(&m, f_min, f_min);
- pango_context_set_matrix(context, &m);
- pango_layout_context_changed(layout);
- pango_renderer_draw_layout(renderer, layout, 0, 0);
- /* clean up renderer */
- gdk_pango_renderer_set_drawable(GDK_PANGO_RENDERER(renderer), NULL);
- gdk_pango_renderer_set_gc(GDK_PANGO_RENDERER(renderer), NULL);
- /* free objects */
- g_object_unref(layout);
- g_object_unref(context);
- }
- /* ----- Debugging support ------------------------------------------------- */
- /*
- * View with make montage or something like
- *
- * montage -label %f -frame 3 __dbg????.png png:- | display -
- */
- void debug_save_pixbuf(GdkPixbuf *buf)
- {
- static int buf_num = 0;
- char name[20]; /* plenty */
- sprintf(name, "__dbg%04d.png", buf_num++);
- gdk_pixbuf_save(buf, name, "png", NULL, NULL);
- fprintf(stderr, "saved to %s\n", name);
- }
- /*
- * gtk_widget_get_snapshot seems to use an expose event to do the drawing. This
- * means that we can't call debug_save_widget from the expose event handler of
- * the widget being dumped.
- */
- #if GTK_CHECK_VERSION(2, 14, 0)
- void debug_save_widget(GtkWidget *widget)
- {
- GdkPixmap *pixmap;
- GdkPixbuf *pixbuf;
- gint w, h;
- pixmap = gtk_widget_get_snapshot(widget, NULL);
- gdk_drawable_get_size(GDK_DRAWABLE(pixmap), &w, &h);
- pixbuf = gdk_pixbuf_get_from_drawable(NULL, GDK_DRAWABLE(pixmap),
- NULL, 0, 0, 0, 0, w, h);
- debug_save_pixbuf(pixbuf);
- gdk_pixmap_unref(pixmap);
- g_object_unref(pixbuf);
- }
- #endif /* GTK_CHECK_VERSION(2, 14, 0) */
- /* ----- kill the content of a container ----------------------------------- */
- static void destroy_callback(GtkWidget *widget, gpointer data)
- {
- gtk_widget_destroy(widget);
- }
- void destroy_all_children(GtkContainer *container)
- {
- gtk_container_foreach(container, destroy_callback, NULL);
- }
- /* ----- get a widget's desired width -------------------------------------- */
- int get_widget_width(GtkWidget *widget)
- {
- GtkRequisition req;
- gtk_widget_show_all(widget);
- gtk_widget_size_request(widget, &req);
- return req.width;
- }
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