zathura/callbacks.c
2011-04-19 21:42:18 +02:00

81 lines
2.1 KiB
C

/* See LICENSE file for license and copyright information */
#include <callbacks.h>
#include <girara.h>
#include <stdlib.h>
#include <gtk/gtk.h>
#include "zathura.h"
#include "render.h"
#include "document.h"
#include "utils.h"
gboolean
cb_destroy(GtkWidget* widget, gpointer data)
{
zathura_free(data);
return TRUE;
}
void
buffer_changed(girara_session_t* session)
{
g_return_if_fail(session != NULL);
g_return_if_fail(session->global.data != NULL);
zathura_t* zathura = session->global.data;
char* buffer = girara_buffer_get(session);
if (buffer) {
girara_statusbar_item_set_text(session, zathura->ui.statusbar.buffer, buffer);
free(buffer);
} else {
girara_statusbar_item_set_text(session, zathura->ui.statusbar.buffer, "");
}
}
void
cb_view_vadjustment_value_changed(GtkAdjustment *adjustment, gpointer data)
{
zathura_t* zathura = data;
if (!zathura || !zathura->document || !zathura->document->pages || !zathura->ui.page_view) {
return;
}
/* get current adjustment values */
gdouble lower = gtk_adjustment_get_value(adjustment);
gdouble upper = lower + gtk_adjustment_get_page_size(adjustment);
/* find page that fits */
for (unsigned int page_id = 0; page_id < zathura->document->number_of_pages; page_id++)
{
zathura_page_t* page = zathura->document->pages[page_id];
page_offset_t* offset = page_calculate_offset(page);
if (offset == NULL) {
continue;
}
double begin = offset->y;
double end = offset->y + page->height;
if ( ( (begin >= lower) && (end <= upper) ) /* [> page is in viewport <]*/
|| ( (begin <= lower) && (end >= lower) && (end <= upper) ) /* [> end of the page is in viewport <] */
|| ( (begin >= lower) && (end >= upper) && (begin <= upper) ) /* [> begin of the page is in viewport <] */
) {
page->visible = true;
if (page->surface == NULL) {
render_page(zathura->sync.render_thread, page);
}
} else {
page->visible = false;
cairo_surface_destroy(page->surface);
page->surface = NULL;
}
free(offset);
}
}