--- /dev/null
+#include <gdk/gdkkeysyms.h>
+
+#include "pager.h"
+
+/* 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 gint
+move_pager_and_get_scroll_distance(GtkTextView *textview)
+{
+ GdkRectangle pagerpos, endpos, visiblerect;
+ GtkTextIter oldpager, newpager, end;
+ GtkTextBuffer *buffer = gtk_text_view_get_buffer(textview);
+ GtkTextMark *pager = gtk_text_buffer_get_mark(buffer, "pager_position");
+
+ /* 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_buffer_get_iter_at_mark(buffer, &oldpager, pager);
+
+ 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_buffer_get_iter_at_mark(buffer, &newpager, pager);
+ 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);
+
+ return endpos.y - pagerpos.y;
+}
+
+/* Helper function: turn on paging for this textview */
+static void
+start_paging(winid_t win)
+{
+ win->currently_paging = TRUE;
+ g_signal_handler_unblock(win->widget, win->pager_expose_handler);
+ g_signal_handler_unblock(win->widget, win->pager_keypress_handler);
+}
+
+/* Helper function: turn off paging for this textview */
+static void
+stop_paging(winid_t win)
+{
+ win->currently_paging = FALSE;
+ g_signal_handler_block(win->widget, win->pager_expose_handler);
+ g_signal_handler_block(win->widget, win->pager_keypress_handler);
+}
+
+/* Update the pager position after new text is inserted in the buffer */
+void
+pager_after_insert_text(GtkTextBuffer *buffer, GtkTextIter *location, gchar *text, gint len, winid_t win)
+{
+ while(gtk_events_pending())
+ gtk_main_iteration();
+
+ /* Move the pager to the last visible character in the buffer */
+ gint scroll_distance = move_pager_and_get_scroll_distance( GTK_TEXT_VIEW(win->widget) );
+
+ if(scroll_distance > 0 && !win->currently_paging)
+ start_paging(win);
+}
+
+void
+pager_after_adjustment_changed(GtkAdjustment *adj, winid_t win)
+{
+ while(gtk_events_pending())
+ gtk_main_iteration();
+
+ /* Move the pager, etc. */
+ gint scroll_distance = move_pager_and_get_scroll_distance( GTK_TEXT_VIEW(win->widget) );
+
+ if(scroll_distance > 0 && !win->currently_paging)
+ start_paging(win);
+ else if(scroll_distance == 0 && win->currently_paging)
+ stop_paging(win);
+
+ /* Refresh the widget so that any extra "more" prompts disappear */
+ gtk_widget_queue_draw(win->widget);
+}
+
+/* Handle key press events in the textview while paging is active */
+gboolean
+pager_on_key_press_event(GtkTextView *textview, GdkEventKey *event, winid_t win)
+{
+ /*** ALTERNATIVE, POSSIBLY INFERIOR, METHOD OF SCROLLING ***
+ GtkTextMark *pagermark = gtk_text_buffer_get_mark(buffer, "pager_position");
+ gtk_text_view_scroll_to_mark(textview, pagermark, 0.0, TRUE, 0.0, 0.0);
+ */
+
+ GtkAdjustment *adj = gtk_scrolled_window_get_vadjustment( GTK_SCROLLED_WINDOW(win->frame) );
+ gdouble step_increment, 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:
+ gtk_adjustment_set_value(adj, CLAMP(value + page_size, lower, upper - page_size));
+ return TRUE;
+ case GDK_Page_Up: case GDK_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));
+ return TRUE;
+ /* don't handle "up" and "down", they're used for input history */
+ }
+
+ return FALSE; /* if the key wasn't handled here, pass it to other handlers */
+}
+
+/* Draw the "more" prompt on top of the buffer, after the regular expose event has run */
+gboolean
+pager_on_expose(GtkTextView *textview, GdkEventExpose *event, winid_t win)
+{
+ /* Calculate the position of the 'more' tag */
+ gint promptwidth, promptheight;
+ pango_layout_get_pixel_size(win->pager_layout, &promptwidth, &promptheight);
+
+ gint winx, winy, winwidth, winheight;
+ gdk_window_get_position(event->window, &winx, &winy);
+ gdk_drawable_get_size(GDK_DRAWABLE(event->window), &winwidth, &winheight);
+
+ /* Draw the 'more' tag */
+ GdkGC *context = gdk_gc_new(GDK_DRAWABLE(event->window));
+ /*
+ gdk_draw_layout_with_colors(event->window, context,
+ winx + winwidth - promptwidth,
+ winy + winheight - promptheight,
+ prompt, &white, &red);
+ */
+ gdk_draw_layout(event->window, context,
+ winx + winwidth - promptwidth,
+ winy + winheight - promptheight,
+ win->pager_layout);
+
+ return FALSE; /* Propagate event further */
+}
projects / projects / chimara / chimara.git / blobdiff