diff options
Diffstat (limited to 'gui/progress.c')
-rw-r--r-- | gui/progress.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/gui/progress.c b/gui/progress.c new file mode 100644 index 0000000..b7f1d39 --- /dev/null +++ b/gui/progress.c @@ -0,0 +1,99 @@ +/* + * gui/progress.c - Progress bar + * + * Written 2016 by Werner Almesberger + * Copyright 2016 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. + */ + +/* + * Resources: + * + * http://zetcode.com/gfx/cairo/cairobackends/ + * https://developer.gnome.org/gtk3/stable/gtk-migrating-2-to-3.html + */ + +#include <stdbool.h> +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <math.h> + +#include <cairo/cairo.h> +#include <gtk/gtk.h> + +#include "gui/common.h" + + +#define PROGRESS_BAR_HEIGHT 10 + + +static void progress_draw_event(GtkWidget *widget, cairo_t *cr, + gpointer user_data) +{ + GtkAllocation alloc; + struct gui_ctx *ctx = user_data; + unsigned w, x; + + x = ctx->progress >> ctx->progress_scale; + if (!x) { + /* @@@ needed ? Gtk seems to always clear the the surface. */ + cairo_set_source_rgb(cr, 1, 1, 1); + cairo_paint(cr); + } + + gtk_widget_get_allocation(ctx->da, &alloc); + w = ctx->hist_size >> ctx->progress_scale; + + cairo_save(cr); + cairo_translate(cr, + (alloc.width - w) / 2, (alloc.height - PROGRESS_BAR_HEIGHT) / 2); + + cairo_set_source_rgb(cr, 0, 0.7, 0); + cairo_set_line_width(cr, 0); + cairo_rectangle(cr, 0, 0, x, PROGRESS_BAR_HEIGHT); + cairo_fill(cr); + + cairo_set_source_rgb(cr, 0, 0, 0); + cairo_set_line_width(cr, 2); + cairo_rectangle(cr, 0, 0, w, PROGRESS_BAR_HEIGHT); + cairo_stroke(cr); + + cairo_restore(cr); +} + + +void setup_progress_bar(struct gui_ctx *ctx, GtkWidget *window) +{ + GtkAllocation alloc; + + gtk_widget_get_allocation(ctx->da, &alloc); + + ctx->progress_scale = 0; + while ((ctx->hist_size >> ctx->progress_scale) > alloc.width) + ctx->progress_scale++; + ctx->progress = 0; + + g_signal_connect(G_OBJECT(ctx->da), "draw", + G_CALLBACK(progress_draw_event), ctx); + + redraw(ctx); + gtk_main_iteration_do(0); +} + + +void progress_update(struct gui_ctx *ctx) +{ + unsigned mask = (1 << ctx->progress_scale) - 1; + + ctx->progress++; + if ((ctx->progress & mask) != mask) + return; + + redraw(ctx); + gtk_main_iteration_do(0); +} |