#include "pager.h"
+/* Not sure if necessary, but this is the margin within which the pager will
+stop paging if it's close to the end of the text buffer */
+#define PAGER_FUZZINESS 1.0
+
/* Helper function: move the pager to the last visible position in the buffer,
and return the distance between the pager and the end of the buffer in buffer
coordinates */
static void
-move_pager_and_get_scroll_distance(GtkTextView *textview, gint *view_height, gint *scroll_distance)
+move_pager_and_get_scroll_distance(GtkTextView *textview, gint *view_height, gint *scroll_distance, gboolean move )
{
- while( gtk_events_pending() ) {
- gtk_main_iteration();
- }
-
GdkRectangle pagerpos, endpos, visiblerect;
GtkTextIter oldpager, newpager, end;
GtkTextBuffer *buffer = gtk_text_view_get_buffer(textview);
/* Get an iter at the lower right corner of the visible part of the buffer */
gtk_text_view_get_visible_rect(textview, &visiblerect);
- gtk_text_view_get_iter_at_location(textview, &newpager, visiblerect.x + visiblerect.width, visiblerect.y + visiblerect.height);
+ gtk_text_view_get_iter_at_location(
+ textview,
+ &newpager,
+ visiblerect.x + visiblerect.width,
+ visiblerect.y + visiblerect.height
+ );
gtk_text_buffer_get_iter_at_mark(buffer, &oldpager, pager);
- gtk_text_buffer_move_mark(buffer, pager, &newpager);
+ if(move)
+ gtk_text_buffer_move_mark(buffer, pager, &newpager);
/* Get the buffer coordinates of the pager and the end iter */
gtk_text_buffer_get_end_iter(buffer, &end);
gtk_text_view_get_iter_location(textview, &newpager, &pagerpos);
gtk_text_view_get_iter_location(textview, &end, &endpos);
- g_printerr("View height = %d\n", visiblerect.height);
- g_printerr("End - Pager = %d\n", endpos.y - pagerpos.y);
-
*view_height = visiblerect.height;
*scroll_distance = endpos.y - pagerpos.y;
}
g_signal_handler_block(win->widget, win->pager_keypress_handler);
}
-/* Update the pager position after new text is inserted in the buffer and the
-text view has calculated where it is */
-void
-pager_after_size_allocate(GtkTextView *view, GtkAllocation *allocation, winid_t win)
+/* Helper function: If the adjustment is at its maximum value, stop paging */
+static void
+check_paging(GtkAdjustment *adj, winid_t win)
{
- while(gtk_events_pending())
- gtk_main_iteration();
-
- /* Move the pager to the last visible character in the buffer */
- gint view_height, scroll_distance;
- move_pager_and_get_scroll_distance( GTK_TEXT_VIEW(win->widget), &view_height, &scroll_distance );
-
- if(view_height <= 1)
- /* Paging is unusable when window is too small */
- return;
-
- if(!win->currently_paging) {
- if(scroll_distance > view_height) {
- start_paging(win);
- /* Seriously... */
- gdk_window_invalidate_rect(gtk_widget_get_window(win->widget), NULL, TRUE);
- }
- else if(scroll_distance > 0) {
- GtkTextBuffer *buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(win->widget));
- gtk_text_view_scroll_mark_onscreen(GTK_TEXT_VIEW(win->widget), gtk_text_buffer_get_mark(buffer, "end_position"));
- while( gtk_events_pending() ) {
- gtk_main_iteration();
- }
- }
- }
+ double page_size, upper, value;
+ g_object_get(adj,
+ "page-size", &page_size,
+ "upper", &upper,
+ "value", &value,
+ NULL);
+ if(value + PAGER_FUZZINESS >= upper - page_size && win->currently_paging)
+ stop_paging(win);
}
+/* When the user scrolls up in a textbuffer, start paging. */
void
pager_after_adjustment_changed(GtkAdjustment *adj, winid_t win)
{
- while(gtk_events_pending())
- gtk_main_iteration();
-
/* Move the pager, etc. */
gint scroll_distance, view_height;
- move_pager_and_get_scroll_distance( GTK_TEXT_VIEW(win->widget), &view_height, &scroll_distance );
-
+ move_pager_and_get_scroll_distance( GTK_TEXT_VIEW(win->widget), &view_height, &scroll_distance, TRUE );
+
if(scroll_distance > 0 && !win->currently_paging)
+ {
start_paging(win);
+ return;
+ }
else if(scroll_distance == 0 && win->currently_paging)
+ {
stop_paging(win);
-
+ gtk_widget_queue_draw(win->widget);
+ return;
+ }
+
/* Refresh the widget so that any extra "more" prompts disappear */
gtk_widget_queue_draw(win->widget);
+
+ check_paging(adj, win);
}
/* Handle key press events in the textview while paging is active */
pager_on_key_press_event(GtkTextView *textview, GdkEventKey *event, winid_t win)
{
GtkAdjustment *adj = gtk_scrolled_window_get_vadjustment( GTK_SCROLLED_WINDOW(win->frame) );
- gdouble step_increment, page_size, upper, lower, value;
+ gdouble page_size, upper, lower, value;
g_object_get(adj,
"page-size", &page_size,
- "step-increment", &step_increment,
"upper", &upper,
"lower", &lower,
"value", &value,
NULL);
switch (event->keyval) {
- case GDK_space: case GDK_KP_Space: case GDK_Page_Down: case GDK_KP_Page_Down:
+ case GDK_KEY_space: case GDK_KEY_KP_Space:
+ case GDK_KEY_Page_Down: case GDK_KEY_KP_Page_Down:
+ case GDK_KEY_Return: case GDK_KEY_KP_Enter:
gtk_adjustment_set_value(adj, CLAMP(value + page_size, lower, upper - page_size));
+ check_paging(adj, win);
return TRUE;
- case GDK_Page_Up: case GDK_KP_Page_Up:
+ case GDK_KEY_Page_Up: case GDK_KEY_KP_Page_Up:
gtk_adjustment_set_value(adj, CLAMP(value - page_size, lower, upper - page_size));
- return TRUE;
- case GDK_Return: case GDK_KP_Enter:
- gtk_adjustment_set_value(adj, CLAMP(value + step_increment, lower, upper - page_size));
+ check_paging(adj, win);
return TRUE;
/* don't handle "up" and "down", they're used for input history */
}
gint promptwidth, promptheight;
pango_layout_get_pixel_size(win->pager_layout, &promptwidth, &promptheight);
- gint winx, winy, winwidth, winheight;
+ int winx, winy;
gdk_window_get_position(event->window, &winx, &winy);
- gdk_drawable_get_size(GDK_DRAWABLE(event->window), &winwidth, &winheight);
+ int winwidth = gdk_window_get_width(event->window);
+ int winheight = gdk_window_get_height(event->window);
/* Draw the 'more' tag */
- GdkGC *context = gdk_gc_new(GDK_DRAWABLE(event->window));
- gdk_draw_layout(event->window, context,
- winx + winwidth - promptwidth,
- winy + winheight - promptheight,
- win->pager_layout);
+ cairo_t *cr = gdk_cairo_create(event->window);
+ cairo_move_to(cr,
+ winx + winwidth - promptwidth,
+ winy + winheight - promptheight);
+ pango_cairo_show_layout(cr, win->pager_layout);
return FALSE; /* Propagate event further */
}
+
+/* Check whether paging should be done. This function is called after the
+ * textview has finished validating text positions. */
+void
+pager_after_size_request(GtkTextView *textview, GtkRequisition *requisition, winid_t win)
+{
+ /* Move the pager to the last visible character in the buffer */
+ gint view_height, scroll_distance;
+ move_pager_and_get_scroll_distance(GTK_TEXT_VIEW(win->widget), &view_height, &scroll_distance, FALSE);
+
+ if(view_height <= 1)
+ /* Paging is unusable when window is too small */
+ return;
+
+ /* If not in interactive mode, then just scroll to the bottom. */
+ ChimaraGlk *glk = CHIMARA_GLK(gtk_widget_get_ancestor(GTK_WIDGET(textview), CHIMARA_TYPE_GLK));
+ g_assert(glk);
+ if(!chimara_glk_get_interactive(glk)) {
+ GtkTextIter end;
+ gtk_text_buffer_get_end_iter(gtk_text_view_get_buffer(textview), &end);
+ gtk_text_view_scroll_to_iter(textview, &end, 0.0, TRUE, 0.0, 0.0);
+ return;
+ }
+
+ /* Scroll past text already read by user. This is automatic scrolling, so disable the pager_ajustment_handler
+ * first, that acts on the belief the scolling is performed by the user. */
+ GtkAdjustment *adj = gtk_scrolled_window_get_vadjustment(GTK_SCROLLED_WINDOW(win->frame));
+ g_signal_handler_block(adj, win->pager_adjustment_handler);
+ GtkTextBuffer *buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(win->widget));
+ GtkTextMark *pager_position = gtk_text_buffer_get_mark(buffer, "pager_position");
+ gtk_text_view_scroll_to_mark(GTK_TEXT_VIEW(win->widget), pager_position, 0.0, TRUE, 0.0, 0.0);
+ g_signal_handler_unblock(adj, win->pager_adjustment_handler);
+
+ if(!win->currently_paging) {
+ if(scroll_distance > view_height) {
+ start_paging(win);
+ gdk_window_invalidate_rect(gtk_widget_get_window(win->widget), NULL, TRUE);
+ }
+ }
+}
+
+void
+pager_update(winid_t win)
+{
+ GtkTextIter input_iter;
+ GtkTextBuffer *buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(win->widget));
+ GtkTextMark *input_position = gtk_text_buffer_get_mark(buffer, "input_position");
+ GtkTextMark *pager_position = gtk_text_buffer_get_mark(buffer, "pager_position");
+ gtk_text_buffer_get_iter_at_mark(buffer, &input_iter, input_position);
+ gtk_text_buffer_move_mark(buffer, pager_position, &input_iter);
+}
projects / projects / chimara / chimara.git / blobdiff