Buttons

src/button/button.c

@@ -0,0 +1,543 @@
+#include "button.h"
+
+#include <string.h>
+#include <stdio.h>
+#include <cairo.h>
+#include <cairo-xlib.h>
+#include <math.h>
+#include <pango/pangocairo.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <time.h>
+#include <fcntl.h>
+
+#include "window.h"
+#include "server.h"
+#include "panel.h"
+#include "timer.h"
+#include "common.h"
+
+char *button_get_tooltip(void *obj);
+void button_init_fonts();
+int button_compute_desired_size(void *obj);
+void button_dump_geometry(void *obj, int indent);
+
+void default_button()
+{
+}
+
+Button *create_button()
+{
+	Button *button = calloc(1, sizeof(Button));
+	button->backend = calloc(1, sizeof(ButtonBackend));
+	button->backend->centered = TRUE;
+	button->backend->font_color.alpha = 0.5;
+	return button;
+}
+
+gpointer create_button_frontend(gconstpointer arg, gpointer data)
+{
+	Button *button_backend = (Button *)arg;
+
+	Button *button_frontend = calloc(1, sizeof(Button));
+	button_frontend->backend = button_backend->backend;
+	button_backend->backend->instances = g_list_append(button_backend->backend->instances, button_frontend);
+	button_frontend->frontend = calloc(1, sizeof(ButtonFrontend));
+	return button_frontend;
+}
+
+void destroy_button(void *obj)
+{
+	Button *button = (Button *)obj;
+	if (button->frontend) {
+		// This is a frontend element
+		if (button->frontend->icon) {
+			imlib_context_set_image(button->frontend->icon);
+			imlib_free_image();
+			button->frontend->icon = NULL;
+		}
+		button->backend->instances = g_list_remove_all(button->backend->instances, button);
+		free_and_null(button->frontend);
+		remove_area(&button->area);
+		free_area(&button->area);
+		free_and_null(button);
+	} else {
+		// This is a backend element
+		free_and_null(button->backend->text);
+		free_and_null(button->backend->icon_name);
+		free_and_null(button->backend->tooltip);
+
+		button->backend->bg = NULL;
+		pango_font_description_free(button->backend->font_desc);
+		button->backend->font_desc = NULL;
+		free_and_null(button->backend->lclick_command);
+		free_and_null(button->backend->mclick_command);
+		free_and_null(button->backend->rclick_command);
+		free_and_null(button->backend->dwheel_command);
+		free_and_null(button->backend->uwheel_command);
+
+		if (button->backend->instances) {
+			fprintf(stderr, "Error: Attempt to destroy backend while there are still frontend instances!\n");
+			exit(-1);
+		}
+		free(button->backend);
+		free(button);
+	}
+}
+
+void init_button()
+{
+	GList *to_remove = panel_config.button_list;
+	for (int k = 0; k < strlen(panel_items_order) && to_remove; k++) {
+		if (panel_items_order[k] == 'E') {
+			to_remove = to_remove->next;
+		}
+	}
+
+	if (to_remove) {
+		if (to_remove == panel_config.button_list) {
+			g_list_free_full(to_remove, destroy_button);
+			panel_config.button_list = NULL;
+		} else {
+			// Cut panel_config.button_list
+			if (to_remove->prev)
+				to_remove->prev->next = NULL;
+			to_remove->prev = NULL;
+			// Remove all elements of to_remove and to_remove itself
+			g_list_free_full(to_remove, destroy_button);
+		}
+	}
+
+	button_init_fonts();
+	for (GList *l = panel_config.button_list; l; l = l->next) {
+		Button *button = l->data;
+
+		// Set missing config options
+		if (!button->backend->bg)
+			button->backend->bg = &g_array_index(backgrounds, Background, 0);
+	}
+}
+
+void init_button_panel(void *p)
+{
+	Panel *panel = (Panel *)p;
+
+	// Make sure this is only done once if there are multiple items
+	if (panel->button_list && ((Button *)panel->button_list->data)->frontend)
+		return;
+
+	// panel->button_list is now a copy of the pointer panel_config.button_list
+	// We make it a deep copy
+	panel->button_list = g_list_copy_deep(panel_config.button_list, create_button_frontend, NULL);
+
+	load_icon_themes();
+
+	for (GList *l = panel->button_list; l; l = l->next) {
+		Button *button = l->data;
+		button->area.bg = button->backend->bg;
+		button->area.paddingx = button->backend->paddingx;
+		button->area.paddingy = button->backend->paddingy;
+		button->area.paddingxlr = button->backend->paddingxlr;
+		button->area.parent = panel;
+		button->area.panel = panel;
+		button->area._dump_geometry = button_dump_geometry;
+		button->area._compute_desired_size = button_compute_desired_size;
+		snprintf(button->area.name, sizeof(button->area.name), "Button");
+		button->area._draw_foreground = draw_button;
+		button->area.size_mode = LAYOUT_FIXED;
+		button->area._resize = resize_button;
+		button->area._get_tooltip_text = button_get_tooltip;
+		button->area._is_under_mouse = full_width_area_is_under_mouse;
+		button->area.has_mouse_press_effect =
+		    panel_config.mouse_effects &&
+		    (button->area.has_mouse_over_effect = button->backend->lclick_command || button->backend->mclick_command ||
+		                                          button->backend->rclick_command || button->backend->uwheel_command ||
+		                                          button->backend->dwheel_command);
+
+		button->area.resize_needed = TRUE;
+		button->area.on_screen = TRUE;
+		instantiate_area_gradients(&button->area);
+
+		button_reload_icon(button);
+	}
+}
+
+void button_init_fonts()
+{
+	for (GList *l = panel_config.button_list; l; l = l->next) {
+		Button *button = l->data;
+		if (!button->backend->font_desc)
+			button->backend->font_desc = pango_font_description_from_string(get_default_font());
+	}
+}
+
+void button_default_font_changed()
+{
+	gboolean needs_update = FALSE;
+	for (GList *l = panel_config.button_list; l; l = l->next) {
+		Button *button = l->data;
+
+		if (!button->backend->has_font) {
+			pango_font_description_free(button->backend->font_desc);
+			button->backend->font_desc = NULL;
+			needs_update = TRUE;
+		}
+	}
+	if (!needs_update)
+		return;
+
+	button_init_fonts();
+	for (int i = 0; i < num_panels; i++) {
+		for (GList *l = panels[i].button_list; l; l = l->next) {
+			Button *button = l->data;
+
+			if (!button->backend->has_font) {
+				button->area.resize_needed = TRUE;
+				schedule_redraw(&button->area);
+			}
+		}
+	}
+	schedule_panel_redraw();
+}
+
+void button_reload_icon(Button *button)
+{
+	free_icon(button->frontend->icon);
+	free_icon(button->frontend->icon_hover);
+	free_icon(button->frontend->icon_pressed);
+	button->frontend->icon = NULL;
+
+	button->frontend->icon_load_size = button->frontend->iconw;
+
+	char *new_icon_path = get_icon_path(icon_theme_wrapper, button->backend->icon_name, button->frontend->iconw, TRUE);
+	if (new_icon_path)
+		button->frontend->icon = imlib_load_image_immediately(new_icon_path);
+	free(new_icon_path);
+	// On loading error, fallback to default
+	if (!button->frontend->icon) {
+		new_icon_path = get_icon_path(icon_theme_wrapper, DEFAULT_ICON, button->frontend->iconw, TRUE);
+		if (new_icon_path)
+			button->frontend->icon = imlib_load_image_immediately(new_icon_path);
+		free(new_icon_path);
+	}
+	Imlib_Image original = button->frontend->icon;
+	button->frontend->icon = scale_icon(button->frontend->icon, button->frontend->iconw);
+	free_icon(original);
+
+	if (panel_config.mouse_effects) {
+		button->frontend->icon_hover = adjust_icon(button->frontend->icon,
+		                                           panel_config.mouse_over_alpha,
+		                                           panel_config.mouse_over_saturation,
+		                                           panel_config.mouse_over_brightness);
+		button->frontend->icon_pressed = adjust_icon(button->frontend->icon,
+		                                             panel_config.mouse_pressed_alpha,
+		                                             panel_config.mouse_pressed_saturation,
+		                                             panel_config.mouse_pressed_brightness);
+	}
+	schedule_redraw(&button->area);
+}
+
+void button_default_icon_theme_changed()
+{
+	for (int i = 0; i < num_panels; i++) {
+		for (GList *l = panels[i].button_list; l; l = l->next) {
+			Button *button = l->data;
+			button_reload_icon(button);
+		}
+	}
+	schedule_panel_redraw();
+}
+
+void cleanup_button()
+{
+	// Cleanup frontends
+	for (int i = 0; i < num_panels; i++) {
+		g_list_free_full(panels[i].button_list, destroy_button);
+		panels[i].button_list = NULL;
+	}
+
+	// Cleanup backends
+	g_list_free_full(panel_config.button_list, destroy_button);
+	panel_config.button_list = NULL;
+}
+
+int button_compute_desired_size(void *obj)
+{
+	Button *button = (Button *)obj;
+	Panel *panel = (Panel *)button->area.panel;
+	int horiz_padding = (panel_horizontal ? button->area.paddingxlr : button->area.paddingy);
+	int vert_padding = (panel_horizontal ? button->area.paddingy : button->area.paddingxlr);
+	int interior_padding = button->area.paddingx;
+
+	int icon_w, icon_h;
+	if (button->backend->icon_name) {
+		if (panel_horizontal)
+			icon_h = icon_w = button->area.height - top_bottom_border_width(&button->area) - 2 * vert_padding;
+		else
+			icon_h = icon_w = button->area.width - left_right_border_width(&button->area) - 2 * horiz_padding;
+	} else {
+		icon_h = icon_w = 0;
+	}
+
+	int txt_height_ink, txt_height, txt_width;
+	if (button->backend->text) {
+		if (panel_horizontal) {
+			get_text_size2(button->backend->font_desc,
+						   &txt_height_ink,
+						   &txt_height,
+						   &txt_width,
+						   panel->area.height,
+						   panel->area.width,
+						   button->backend->text,
+						   strlen(button->backend->text),
+						   PANGO_WRAP_WORD_CHAR,
+						   PANGO_ELLIPSIZE_NONE,
+						   FALSE);
+		} else {
+			get_text_size2(button->backend->font_desc,
+						   &txt_height_ink,
+						   &txt_height,
+						   &txt_width,
+						   panel->area.height,
+						   button->area.width - icon_w - (icon_w ? interior_padding : 0) -
+							   2 * horiz_padding - left_right_border_width(&button->area),
+						   button->backend->text,
+						   strlen(button->backend->text),
+						   PANGO_WRAP_WORD_CHAR,
+						   PANGO_ELLIPSIZE_NONE,
+						   FALSE);
+		}
+	} else {
+		txt_height_ink = txt_height = txt_width = 0;
+	}
+
+	if (panel_horizontal) {
+		int new_size = txt_width + icon_w + (txt_width && icon_w ? interior_padding : 0);
+		new_size += 2 * horiz_padding + left_right_border_width(&button->area);
+		return new_size;
+	} else {
+		int new_size;
+		new_size = txt_height + 2 * vert_padding + top_bottom_border_width(&button->area);
+		new_size = MAX(new_size, icon_h + 2 * vert_padding + top_bottom_border_width(&button->area));
+		return new_size;
+	}
+}
+
+gboolean resize_button(void *obj)
+{
+	Button *button = (Button *)obj;
+	Panel *panel = (Panel *)button->area.panel;
+	int horiz_padding = (panel_horizontal ? button->area.paddingxlr : button->area.paddingy);
+	int vert_padding = (panel_horizontal ? button->area.paddingy : button->area.paddingxlr);
+	int interior_padding = button->area.paddingx;
+
+	int icon_w, icon_h;
+	if (button->backend->icon_name) {
+		if (panel_horizontal)
+			icon_h = icon_w = button->area.height - top_bottom_border_width(&button->area) - 2 * vert_padding;
+		else
+			icon_h = icon_w = button->area.width - left_right_border_width(&button->area) - 2 * horiz_padding;
+	} else {
+		icon_h = icon_w = 0;
+	}
+
+	button->frontend->iconw = icon_w;
+	button->frontend->iconh = icon_h;
+	if (button->frontend->icon_load_size != button->frontend->iconw)
+		button_reload_icon(button);
+
+	int txt_height_ink, txt_height, txt_width;
+	if (button->backend->text) {
+		if (panel_horizontal) {
+			get_text_size2(button->backend->font_desc,
+						   &txt_height_ink,
+						   &txt_height,
+						   &txt_width,
+						   panel->area.height,
+						   panel->area.width,
+						   button->backend->text,
+						   strlen(button->backend->text),
+						   PANGO_WRAP_WORD_CHAR,
+						   PANGO_ELLIPSIZE_NONE,
+						   FALSE);
+		} else {
+			get_text_size2(button->backend->font_desc,
+						   &txt_height_ink,
+						   &txt_height,
+						   &txt_width,
+						   panel->area.height,
+						   button->area.width - icon_w - (icon_w ? interior_padding : 0) -
+							   2 * horiz_padding - left_right_border_width(&button->area),
+						   button->backend->text,
+						   strlen(button->backend->text),
+						   PANGO_WRAP_WORD_CHAR,
+						   PANGO_ELLIPSIZE_NONE,
+						   FALSE);
+		}
+	} else {
+		txt_height_ink = txt_height = txt_width = 0;
+	}
+
+	gboolean result = FALSE;
+	if (panel_horizontal) {
+		int new_size = txt_width + icon_w + (txt_width && icon_w ? interior_padding : 0);
+		new_size += 2 * horiz_padding + left_right_border_width(&button->area);
+		if (new_size != button->area.width) {
+			button->area.width = new_size;
+			result = TRUE;
+		}
+	} else {
+		int new_size;
+		new_size = txt_height + 2 * vert_padding + top_bottom_border_width(&button->area);
+		new_size = MAX(new_size, icon_h + 2 * vert_padding + top_bottom_border_width(&button->area));
+		if (new_size != button->area.height) {
+			button->area.height = new_size;
+			result = TRUE;
+		}
+	}
+	button->frontend->textw = txt_width;
+	button->frontend->texth = txt_height;
+	if (button->backend->centered) {
+		if (icon_w) {
+			button->frontend->icony = (button->area.height - icon_h) / 2;
+			button->frontend->iconx = (button->area.width - txt_width - (txt_width ? interior_padding : 0) - icon_w) / 2;
+			button->frontend->texty = (button->area.height - txt_height) / 2;
+			button->frontend->textx = button->frontend->iconx + icon_w + interior_padding;
+		} else {
+			button->frontend->texty = (button->area.height - txt_height) / 2;
+			button->frontend->textx = (button->area.width - txt_width) / 2;
+		}
+	} else {
+		if (icon_w) {
+			button->frontend->icony = (button->area.height - icon_h) / 2;
+			button->frontend->iconx = left_border_width(&button->area) + horiz_padding;
+			button->frontend->texty = (button->area.height - txt_height) / 2;
+			button->frontend->textx = button->frontend->iconx + icon_w + interior_padding;
+		} else {
+			button->frontend->texty = (button->area.height - txt_height) / 2;
+			button->frontend->textx = left_border_width(&button->area) + horiz_padding;
+		}
+	}
+
+	schedule_redraw(&button->area);
+
+	return result;
+}
+
+void draw_button(void *obj, cairo_t *c)
+{
+	Button *button = obj;
+
+	if (button->frontend->icon) {
+		imlib_context_set_image(button->frontend->icon);
+		// Render icon
+		render_image(button->area.pix, button->frontend->iconx, button->frontend->icony);
+	}
+
+	// Render text
+	if (button->backend->text) {
+		PangoLayout *layout = pango_cairo_create_layout(c);
+
+		pango_layout_set_font_description(layout, button->backend->font_desc);
+		pango_layout_set_width(layout, button->frontend->textw * PANGO_SCALE);
+		pango_layout_set_alignment(layout, button->backend->centered ? PANGO_ALIGN_CENTER : PANGO_ALIGN_LEFT);
+		pango_layout_set_wrap(layout, PANGO_WRAP_WORD_CHAR);
+		pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_NONE);
+		pango_layout_set_text(layout, button->backend->text, strlen(button->backend->text));
+
+		pango_cairo_update_layout(c, layout);
+		draw_text(layout,
+				  c,
+				  button->frontend->textx,
+				  button->frontend->texty,
+				  &button->backend->font_color,
+				  panel_config.font_shadow);
+
+		g_object_unref(layout);
+	}
+}
+
+void button_dump_geometry(void *obj, int indent)
+{
+	Button *button = obj;
+
+	if (button->frontend->icon) {
+		Imlib_Image tmp = imlib_context_get_image();
+		imlib_context_set_image(button->frontend->icon);
+		fprintf(stderr,
+		        "%*sIcon: x = %d, y = %d, w = %d, h = %d\n",
+		        indent,
+		        "",
+		        button->frontend->iconx,
+		        button->frontend->icony,
+		        imlib_image_get_width(),
+		        imlib_image_get_height());
+		if (tmp)
+			imlib_context_set_image(tmp);
+	}
+	fprintf(stderr,
+	        "%*sText: x = %d, y = %d, w = %d, align = %s, text = %s\n",
+	        indent,
+	        "",
+	        button->frontend->textx,
+	        button->frontend->texty,
+	        button->frontend->textw,
+	        button->backend->centered ? "center" : "left",
+	        button->backend->text);
+}
+
+void button_action(void *obj, int mouse_button, int x, int y)
+{
+	Button *button = obj;
+	char *command = NULL;
+	switch (mouse_button) {
+	case 1:
+		command = button->backend->lclick_command;
+		break;
+	case 2:
+		command = button->backend->mclick_command;
+		break;
+	case 3:
+		command = button->backend->rclick_command;
+		break;
+	case 4:
+		command = button->backend->uwheel_command;
+		break;
+	case 5:
+		command = button->backend->dwheel_command;
+		break;
+	}
+	if (command) {
+		char *full_cmd = g_strdup_printf("export BUTTON_X=%d;"
+		                                 "export BUTTON_Y=%d;"
+		                                 "export BUTTON_W=%d;"
+		                                 "export BUTTON_H=%d; %s",
+		                                 x,
+		                                 y,
+		                                 button->area.width,
+		                                 button->area.height,
+		                                 command);
+		pid_t pid = fork();
+		if (pid < 0) {
+			fprintf(stderr, "Could not fork\n");
+		} else if (pid == 0) {
+			// Child process
+			// Allow children to exist after parent destruction
+			setsid();
+			// Run the command
+			execl("/bin/sh", "/bin/sh", "-c", full_cmd, NULL);
+			fprintf(stderr, "Failed to execlp %s\n", full_cmd);
+			exit(1);
+		}
+	}
+}
+
+char *button_get_tooltip(void *obj)
+{
+	Button *button = obj;
+
+	if (button->backend->tooltip && strlen(button->backend->tooltip) > 0)
+		return strdup(button->backend->tooltip);
+	return NULL;
+}