mirror of
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100 lines
2.1 KiB
C
100 lines
2.1 KiB
C
/*
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* gui/progress.c - Progress bar
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*
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* Written 2016 by Werner Almesberger
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* Copyright 2016 by Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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/*
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* Resources:
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*
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* http://zetcode.com/gfx/cairo/cairobackends/
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* https://developer.gnome.org/gtk3/stable/gtk-migrating-2-to-3.html
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*/
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#include <stdbool.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include <cairo/cairo.h>
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#include <gtk/gtk.h>
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#include "gui/common.h"
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#define PROGRESS_BAR_HEIGHT 10
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static void progress_draw_event(GtkWidget *widget, cairo_t *cr,
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gpointer user_data)
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{
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GtkAllocation alloc;
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struct gui_ctx *ctx = user_data;
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unsigned w, x;
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x = ctx->progress >> ctx->progress_scale;
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if (!x) {
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/* @@@ needed ? Gtk seems to always clear the the surface. */
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cairo_set_source_rgb(cr, 1, 1, 1);
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cairo_paint(cr);
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}
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gtk_widget_get_allocation(ctx->da, &alloc);
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w = ctx->hist_size >> ctx->progress_scale;
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cairo_save(cr);
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cairo_translate(cr,
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(alloc.width - w) / 2, (alloc.height - PROGRESS_BAR_HEIGHT) / 2);
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cairo_set_source_rgb(cr, 0, 0.7, 0);
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cairo_set_line_width(cr, 0);
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cairo_rectangle(cr, 0, 0, x, PROGRESS_BAR_HEIGHT);
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cairo_fill(cr);
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cairo_set_source_rgb(cr, 0, 0, 0);
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cairo_set_line_width(cr, 2);
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cairo_rectangle(cr, 0, 0, w, PROGRESS_BAR_HEIGHT);
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cairo_stroke(cr);
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cairo_restore(cr);
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}
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void setup_progress_bar(struct gui_ctx *ctx, GtkWidget *window)
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{
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GtkAllocation alloc;
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gtk_widget_get_allocation(ctx->da, &alloc);
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ctx->progress_scale = 0;
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while ((ctx->hist_size >> ctx->progress_scale) > alloc.width)
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ctx->progress_scale++;
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ctx->progress = 0;
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g_signal_connect(G_OBJECT(ctx->da), "draw",
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G_CALLBACK(progress_draw_event), ctx);
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redraw(ctx);
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gtk_main_iteration_do(0);
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}
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void progress_update(struct gui_ctx *ctx)
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{
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unsigned mask = (1 << ctx->progress_scale) - 1;
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ctx->progress++;
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if ((ctx->progress & mask) != mask)
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return;
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redraw(ctx);
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gtk_main_iteration_do(0);
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}
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