1 #include <gdk/gdkkeysyms.h>
5 /* Helper function: move the pager to the last visible position in the buffer,
6 and return the distance between the pager and the end of the buffer in buffer
9 move_pager_and_get_scroll_distance(GtkTextView *textview, gint *view_height, gint *scroll_distance, gboolean move )
11 GdkRectangle pagerpos, endpos, visiblerect;
12 GtkTextIter oldpager, newpager, end;
13 GtkTextBuffer *buffer = gtk_text_view_get_buffer(textview);
14 GtkTextMark *pager = gtk_text_buffer_get_mark(buffer, "pager_position");
16 /* Get an iter at the lower right corner of the visible part of the buffer */
17 gtk_text_view_get_visible_rect(textview, &visiblerect);
18 gtk_text_view_get_iter_at_location(
21 visiblerect.x + visiblerect.width,
22 visiblerect.y + visiblerect.height
24 gtk_text_buffer_get_iter_at_mark(buffer, &oldpager, pager);
27 gtk_text_buffer_move_mark(buffer, pager, &newpager);
29 /* Get the buffer coordinates of the pager and the end iter */
30 gtk_text_buffer_get_end_iter(buffer, &end);
31 gtk_text_buffer_get_iter_at_mark(buffer, &newpager, pager);
32 gtk_text_view_get_iter_location(textview, &newpager, &pagerpos);
33 gtk_text_view_get_iter_location(textview, &end, &endpos);
35 g_printerr("View height = %d\n", visiblerect.height);
36 g_printerr("End - Pager = %d\n", endpos.y - pagerpos.y);
38 *view_height = visiblerect.height;
39 *scroll_distance = endpos.y - pagerpos.y;
42 /* Helper function: turn on paging for this textview */
44 start_paging(winid_t win)
46 printf("Start paging\n");
47 win->currently_paging = TRUE;
48 g_signal_handler_unblock(win->widget, win->pager_expose_handler);
49 g_signal_handler_unblock(win->widget, win->pager_keypress_handler);
52 /* Helper function: turn off paging for this textview */
54 stop_paging(winid_t win)
56 printf("Stop paging\n");
57 win->currently_paging = FALSE;
58 g_signal_handler_block(win->widget, win->pager_expose_handler);
59 g_signal_handler_block(win->widget, win->pager_keypress_handler);
62 /* Check whether paging should be done. This function is called inside the
63 * idle handler, after the textview has finished updating. */
65 pager_check(gpointer data)
68 printf("pager check (idle)...\n");
69 winid_t win = (winid_t) data;
72 /* Move the pager to the last visible character in the buffer */
73 gint view_height, scroll_distance;
74 move_pager_and_get_scroll_distance( GTK_TEXT_VIEW(win->widget), &view_height, &scroll_distance, FALSE );
79 /* Paging is unusable when window is too small */
82 if(!win->currently_paging) {
83 if(scroll_distance > view_height) {
87 #if GTK_CHECK_VERSION(2,14,0)
88 gdk_window_invalidate_rect(gtk_widget_get_window(win->widget), NULL, TRUE);
90 gdk_window_invalidate_rect(win->widget->window, NULL, TRUE);
93 else if(scroll_distance > 0) {
94 if(win->input_request_type != INPUT_REQUEST_NONE) {
95 GtkTextBuffer *buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(win->widget));
96 GtkTextMark *end = gtk_text_buffer_get_mark(buffer, "end_position");
98 gtk_text_view_scroll_mark_onscreen(GTK_TEXT_VIEW(win->widget), end);
104 /* Returning FALSE to prevent this function from being called multiple times */
108 /* When the user scrolls up in a textbuffer, start paging. */
110 pager_after_adjustment_changed(GtkAdjustment *adj, winid_t win)
112 /* Move the pager, etc. */
113 gint scroll_distance, view_height;
114 move_pager_and_get_scroll_distance( GTK_TEXT_VIEW(win->widget), &view_height, &scroll_distance, TRUE );
116 if(scroll_distance > 0 && !win->currently_paging)
118 else if(scroll_distance == 0 && win->currently_paging)
121 /* Refresh the widget so that any extra "more" prompts disappear */
122 gtk_widget_queue_draw(win->widget);
125 /* Handle key press events in the textview while paging is active */
127 pager_on_key_press_event(GtkTextView *textview, GdkEventKey *event, winid_t win)
129 GtkAdjustment *adj = gtk_scrolled_window_get_vadjustment( GTK_SCROLLED_WINDOW(win->frame) );
130 gdouble step_increment, page_size, upper, lower, value;
132 "page-size", &page_size,
133 "step-increment", &step_increment,
139 switch (event->keyval) {
140 case GDK_space: case GDK_KP_Space: case GDK_Page_Down: case GDK_KP_Page_Down:
141 gtk_adjustment_set_value(adj, CLAMP(value + page_size, lower, upper - page_size));
143 case GDK_Page_Up: case GDK_KP_Page_Up:
144 gtk_adjustment_set_value(adj, CLAMP(value - page_size, lower, upper - page_size));
146 case GDK_Return: case GDK_KP_Enter:
147 gtk_adjustment_set_value(adj, CLAMP(value + step_increment, lower, upper - page_size));
149 /* don't handle "up" and "down", they're used for input history */
152 return FALSE; /* if the key wasn't handled here, pass it to other handlers */
155 /* Draw the "more" prompt on top of the buffer, after the regular expose event has run */
157 pager_on_expose(GtkTextView *textview, GdkEventExpose *event, winid_t win)
159 /* Calculate the position of the 'more' tag */
160 gint promptwidth, promptheight;
161 pango_layout_get_pixel_size(win->pager_layout, &promptwidth, &promptheight);
163 gint winx, winy, winwidth, winheight;
164 gdk_window_get_position(event->window, &winx, &winy);
165 gdk_drawable_get_size(GDK_DRAWABLE(event->window), &winwidth, &winheight);
167 /* Draw the 'more' tag */
168 GdkGC *context = gdk_gc_new(GDK_DRAWABLE(event->window));
169 gdk_draw_layout(event->window, context,
170 winx + winwidth - promptwidth,
171 winy + winheight - promptheight,
174 return FALSE; /* Propagate event further */
178 pager_after_expose_event(GtkTextView *textview, GdkEventExpose *event, winid_t win)
180 printf("pager check (expose)...\n");
181 g_idle_add(pager_check, win);
183 // /* Move the pager to the last visible character in the buffer */
184 // gint view_height, scroll_distance;
185 // move_pager_and_get_scroll_distance( GTK_TEXT_VIEW(win->widget), &view_height, &scroll_distance, FALSE );
187 // if(view_height <= 1)
188 // /* Paging is unusable when window is too small */
191 // if(!win->currently_paging) {
192 // if(scroll_distance > view_height) {
193 // start_paging(win);
194 // /* Seriously... */
196 //#if GTK_CHECK_VERSION(2,14,0)
197 // gdk_window_invalidate_rect(gtk_widget_get_window(win->widget), NULL, TRUE);
199 // gdk_window_invalidate_rect(win->widget->window, NULL, TRUE);
202 // else if(scroll_distance > 0) {
203 // if(win->input_request_type != INPUT_REQUEST_NONE) {
204 // GtkTextBuffer *buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(win->widget));
205 // GtkTextMark *end = gtk_text_buffer_get_mark(buffer, "end_position");
207 // gtk_text_view_scroll_mark_onscreen(GTK_TEXT_VIEW(win->widget), end);
216 pager_after_size_request(GtkTextView *textview, GtkRequisition *requisition, winid_t win)
218 printf("pager check (size request)...\n");
219 g_idle_add(pager_check, win);