1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
#include "window.h"
#include "ui.h"
#include "draw.h"
#include <gtk/gtk.h>
static GtkWidget *drawingArea = NULL;
static GtkAdjustment *hAdjustment = NULL, *vAdjustment = NULL;
static gboolean deleteEvent(GtkWidget *widget, GdkEvent *event, gpointer data) {
return FALSE;
}
static gboolean scrollEvent(GtkWidget *widget, GdkEventScroll *event, gpointer user_data) {
const gdouble x = event->x/widget->allocation.width, y = event->y/widget->allocation.height;
switch(event->direction) {
case GDK_SCROLL_UP:
zoomIn(1.1, x, y);
break;
case GDK_SCROLL_DOWN:
zoomOut(1.1, x, y);
}
}
static void destroy(GtkWidget *widget, gpointer data) {
gtk_main_quit();
}
static void refreshScrolling() {
if(getImageWidth() < drawingArea->allocation.width)
setXTranslate((getImageWidth()-drawingArea->allocation.width)/2);
else
setXTranslate(gtk_adjustment_get_value(hAdjustment));
if(getImageHeight() < drawingArea->allocation.height)
setYTranslate((getImageHeight()-drawingArea->allocation.height)/2);
else
setYTranslate(gtk_adjustment_get_value(vAdjustment));
gtk_widget_queue_draw(drawingArea);
}
static void updateScrollbars(double x, double y) {
const gdouble imageWidth = getImageWidth(), imageHeight = getImageHeight();
const gdouble width = drawingArea->allocation.width, height = drawingArea->allocation.height;
gdouble upper, pageSize, value;
gdk_window_freeze_updates(drawingArea->window);
g_object_get(G_OBJECT(hAdjustment), "upper", &upper, "page_size", &pageSize, NULL);
g_object_set(G_OBJECT(hAdjustment), "upper", imageWidth, "page_size", width, NULL);
gtk_adjustment_changed(hAdjustment);
if((pageSize > upper && width < imageWidth) || upper == 0)
value = (imageWidth-width)/2;
else
value = (gtk_adjustment_get_value(hAdjustment)+pageSize*x)/upper*imageWidth-width*x;
gtk_adjustment_set_value(hAdjustment, MAX(MIN(value, imageWidth-width), 0));
g_object_get(G_OBJECT(vAdjustment), "upper", &upper, "page_size", &pageSize, NULL);
g_object_set(G_OBJECT(vAdjustment), "upper", imageHeight, "page_size", height, NULL);
if((pageSize > upper && height < imageHeight) || upper == 0)
value = (imageHeight-height)/2;
else
value = (gtk_adjustment_get_value(vAdjustment)+pageSize*y)/upper*imageHeight-height*y;
gtk_adjustment_set_value(vAdjustment, MAX(MIN(value, imageHeight-height), 0));
gdk_window_thaw_updates(drawingArea->window);
refreshScrolling();
}
static void updateScrollbarsCentered() {
updateScrollbars(0.5, 0.5);
}
GtkWidget* createMainWindow() {
GtkWidget *window, *vbox, *menubar, *toolbar, *table, *vScroll, *hScroll;
GdkColor color = {0, 0, 0, 0};
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_default_size(GTK_WINDOW(window), 640, 480);
g_signal_connect(G_OBJECT(window), "delete-event", G_CALLBACK(deleteEvent), NULL);
g_signal_connect(G_OBJECT(window), "destroy", G_CALLBACK(destroy), NULL);
vbox = gtk_vbox_new(FALSE, 0);
gtk_container_add(GTK_CONTAINER(window), vbox);
menubar = getMenu();
gtk_box_pack_start(GTK_BOX(vbox), menubar, FALSE, FALSE, 0);
toolbar = getToolbar();
gtk_box_pack_start(GTK_BOX(vbox), toolbar, FALSE, FALSE, 0);
gtk_window_add_accel_group(GTK_WINDOW(window), getAccels());
table = gtk_table_new(2, 2, FALSE);
gtk_box_pack_end(GTK_BOX(vbox), table, TRUE, TRUE, 0);
drawingArea = gtk_drawing_area_new();
gtk_widget_modify_bg(drawingArea, GTK_WIDGET_STATE(drawingArea), &color);
g_signal_connect(G_OBJECT(drawingArea), "configure-event", G_CALLBACK(updateScrollbarsCentered), NULL);
g_signal_connect(G_OBJECT(drawingArea), "expose-event", G_CALLBACK(drawTopView), NULL);
g_signal_connect(G_OBJECT(drawingArea), "scroll-event", G_CALLBACK(scrollEvent), NULL);
gtk_widget_add_events(drawingArea, GDK_SCROLL_MASK);
gtk_table_attach(GTK_TABLE(table), drawingArea, 0, 1, 0, 1, GTK_FILL|GTK_EXPAND|GTK_SHRINK, GTK_FILL|GTK_EXPAND|GTK_SHRINK, 0, 0);
hAdjustment = GTK_ADJUSTMENT(gtk_adjustment_new(0, 0, 0, 10, 100, 100));
hScroll = gtk_hscrollbar_new(hAdjustment);
g_signal_connect(G_OBJECT(hScroll), "value-changed", G_CALLBACK(refreshScrolling), NULL);
gtk_table_attach(GTK_TABLE(table), hScroll, 0, 1, 1, 2, GTK_FILL|GTK_EXPAND|GTK_SHRINK, 0, 0, 0);
vAdjustment = GTK_ADJUSTMENT(gtk_adjustment_new(0, 0, 0, 10, 100, 100));
vScroll = gtk_vscrollbar_new(vAdjustment);
g_signal_connect(G_OBJECT(vScroll), "value-changed", G_CALLBACK(refreshScrolling), NULL);
gtk_table_attach(GTK_TABLE(table), vScroll, 1, 2, 0, 1, 0, GTK_FILL|GTK_EXPAND|GTK_SHRINK, 0, 0);
gtk_widget_show_all(vbox);
return window;
}
void zoomIn(double factor, double x, double y) {
setScale(getScale()*factor);
updateScrollbars(x, y);
}
void zoomOut(double factor, double x, double y) {
setScale(getScale()/factor);
updateScrollbars(x, y);
}
void zoomInCentered(double factor) {
zoomIn(factor, 0.5, 0.5);
}
void zoomOutCentered(double factor) {
zoomOut(factor, 0.5, 0.5);
}
|
