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| 1 | /* |
| 2 | * gui/progress.c - Progress bar |
| 3 | * |
| 4 | * Written 2016 by Werner Almesberger |
| 5 | * Copyright 2016 by Werner Almesberger |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | /* |
| 14 | * Resources: |
| 15 | * |
| 16 | * http://zetcode.com/gfx/cairo/cairobackends/ |
| 17 | * https://developer.gnome.org/gtk3/stable/gtk-migrating-2-to-3.html |
| 18 | */ |
| 19 | |
| 20 | #include <stdbool.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <stdio.h> |
| 23 | #include <string.h> |
| 24 | #include <math.h> |
| 25 | |
| 26 | #include <cairo/cairo.h> |
| 27 | #include <gtk/gtk.h> |
| 28 | |
| 29 | #include "gui/common.h" |
| 30 | |
| 31 | |
| 32 | #define PROGRESS_BAR_HEIGHT 10 |
| 33 | |
| 34 | |
| 35 | static void progress_draw_event(GtkWidget *widget, cairo_t *cr, |
| 36 | gpointer user_data) |
| 37 | { |
| 38 | GtkAllocation alloc; |
| 39 | struct gui_ctx *ctx = user_data; |
| 40 | unsigned w, x; |
| 41 | |
| 42 | x = ctx->progress >> ctx->progress_scale; |
| 43 | if (!x) { |
| 44 | /* @@@ needed ? Gtk seems to always clear the the surface. */ |
| 45 | cairo_set_source_rgb(cr, 1, 1, 1); |
| 46 | cairo_paint(cr); |
| 47 | } |
| 48 | |
| 49 | gtk_widget_get_allocation(ctx->da, &alloc); |
| 50 | w = ctx->hist_size >> ctx->progress_scale; |
| 51 | |
| 52 | cairo_save(cr); |
| 53 | cairo_translate(cr, |
| 54 | (alloc.width - w) / 2, (alloc.height - PROGRESS_BAR_HEIGHT) / 2); |
| 55 | |
| 56 | cairo_set_source_rgb(cr, 0, 0.7, 0); |
| 57 | cairo_set_line_width(cr, 0); |
| 58 | cairo_rectangle(cr, 0, 0, x, PROGRESS_BAR_HEIGHT); |
| 59 | cairo_fill(cr); |
| 60 | |
| 61 | cairo_set_source_rgb(cr, 0, 0, 0); |
| 62 | cairo_set_line_width(cr, 2); |
| 63 | cairo_rectangle(cr, 0, 0, w, PROGRESS_BAR_HEIGHT); |
| 64 | cairo_stroke(cr); |
| 65 | |
| 66 | cairo_restore(cr); |
| 67 | } |
| 68 | |
| 69 | |
| 70 | void setup_progress_bar(struct gui_ctx *ctx, GtkWidget *window) |
| 71 | { |
| 72 | GtkAllocation alloc; |
| 73 | |
| 74 | gtk_widget_get_allocation(ctx->da, &alloc); |
| 75 | |
| 76 | ctx->progress_scale = 0; |
| 77 | while ((ctx->hist_size >> ctx->progress_scale) > alloc.width) |
| 78 | ctx->progress_scale++; |
| 79 | ctx->progress = 0; |
| 80 | |
| 81 | g_signal_connect(G_OBJECT(ctx->da), "draw", |
| 82 | G_CALLBACK(progress_draw_event), ctx); |
| 83 | |
| 84 | redraw(ctx); |
| 85 | gtk_main_iteration_do(0); |
| 86 | } |
| 87 | |
| 88 | |
| 89 | void progress_update(struct gui_ctx *ctx) |
| 90 | { |
| 91 | unsigned mask = (1 << ctx->progress_scale) - 1; |
| 92 | |
| 93 | ctx->progress++; |
| 94 | if ((ctx->progress & mask) != mask) |
| 95 | return; |
| 96 | |
| 97 | redraw(ctx); |
| 98 | gtk_main_iteration_do(0); |
| 99 | } |
| 100 |
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