Plug slideshow back in

1 files changed, 285 insertions, 0 deletions

diff --git a/src/slideshow.c b/src/slideshow.c
new file mode 100644
index 0000000..bff8edd
--- /dev/null
+++ b/src/slideshow.c
@@ -0,0 +1,285 @@
+/*
+ * slideshow.c
+ *
+ * Colloquium - A tiny presentation program
+ *
+ * Copyright (c) 2011 Thomas White <taw@bitwiz.org.uk>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <gtk/gtk.h>
+#include <gdk/gdkkeysyms.h>
+
+#include "presentation.h"
+#include "mainwindow.h"
+
+
+static gint ss_destroy_sig(GtkWidget *widget, struct presentation *p)
+{
+	p->slideshow = NULL;
+	g_object_unref(p->blank_cursor);
+	return FALSE;
+}
+
+
+static gboolean ss_draw_sig(GtkWidget *da, cairo_t *cr, struct presentation *p)
+{
+	GtkAllocation allocation;
+	double xoff, yoff;
+	double width, height;
+
+	width = gtk_widget_get_allocated_width(GTK_WIDGET(da));
+	height = gtk_widget_get_allocated_height(GTK_WIDGET(da));
+
+	/* Overall background */
+	cairo_rectangle(cr, 0.0, 0.0, width, height);
+	cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
+	cairo_fill(cr);
+
+	if ( !p->ss_blank ) {
+
+		int h;
+
+		h = p->proj_slide_width * p->slide_height / p->slide_width;
+
+		/* Get the overall size */
+		gtk_widget_get_allocation(da, &allocation);
+		xoff = (allocation.width - p->proj_slide_width)/2.0;
+		yoff = (allocation.height - h)/2.0;
+
+		/* Draw the slide from the cache */
+		cairo_rectangle(cr, 0.0, 0.0, width, height);
+		cairo_set_source_surface(cr, p->cur_proj_slide->rendered_proj,
+		                         xoff, yoff);
+		cairo_fill(cr);
+
+	}
+
+	return FALSE;
+}
+
+
+void notify_slideshow_slide_changed(struct presentation *p, struct slide *np)
+{
+	if ( (p->cur_proj_slide != NULL)
+	  && (p->cur_proj_slide->rendered_edit != NULL) )
+	{
+		cairo_surface_destroy(p->cur_proj_slide->rendered_proj);
+		p->cur_proj_slide->rendered_proj = NULL;
+	}
+	p->cur_proj_slide = np;
+}
+
+
+static void change_slide(struct presentation *p, signed int n)
+{
+
+	int cur_slide_number;
+
+	/* If linked, it doesn't matter whether we work from the editor or
+	 * slideshow position because they're showing the same thing.  If not,
+	 * then we must use the editor's slide. */
+	cur_slide_number = slide_number(p, p->cur_edit_slide);
+
+	if ( cur_slide_number+n < 0 ) return;
+	if ( cur_slide_number+n >= p->num_slides ) return;
+
+	p->ss_blank = 0;
+
+	if ( p->slideshow_linked ) {
+
+		/* If we are currently "linked", update both. */
+		notify_slideshow_slide_changed(p, p->slides[cur_slide_number+n]);
+		notify_slide_changed(p, p->slides[cur_slide_number+n]);
+
+	} else {
+
+		/* If we are not linked, a slide change on the "slideshow"
+		 * actually affects the editor. */
+		notify_slide_changed(p, p->slides[cur_slide_number+n]);
+		/* p->cur_proj_slide not changed */
+
+	}
+}
+
+
+static gint prev_slide_sig(GtkWidget *widget, struct presentation *p)
+{
+	change_slide(p, -1);
+	return FALSE;
+}
+
+
+static gint next_slide_sig(GtkWidget *widget, struct presentation *p)
+{
+	change_slide(p, +1);
+	return FALSE;
+}
+
+
+void end_slideshow(struct presentation *p)
+{
+	gtk_widget_destroy(p->ss_drawingarea);
+	gtk_widget_destroy(p->slideshow);
+	p->slideshow = NULL;
+
+	if ( (p->cur_proj_slide != NULL)
+	  && (p->cur_proj_slide->rendered_edit != NULL) )
+	{
+		cairo_surface_destroy(p->cur_proj_slide->rendered_proj);
+		p->cur_proj_slide->rendered_proj = NULL;
+	}
+
+	p->cur_proj_slide = NULL;
+	/* FIXME: Update mainwindow */
+}
+
+
+void toggle_slideshow_link(struct presentation *p)
+{
+	p->slideshow_linked = 1 - p->slideshow_linked;
+	if ( p->slideshow_linked ) {
+		p->cur_proj_slide = p->cur_edit_slide;
+		notify_slideshow_slide_changed(p, p->cur_proj_slide);
+	}
+	/* FIXME: Update mainwindow */
+}
+
+
+void check_toggle_blank(struct presentation *p)
+{
+	if ( p->slideshow != NULL ) {
+		//if ( p->prefs->b_splits ) {
+			toggle_slideshow_link(p);
+		//} else {
+		//	p->ss_blank = 1-p->ss_blank;
+		//	gdk_window_invalidate_rect(p->ss_drawingarea->window,
+		//			           NULL, FALSE);
+		//}  FIXME!
+	}
+}
+
+
+static gboolean ss_key_press_sig(GtkWidget *da, GdkEventKey *event,
+                              struct presentation *p)
+{
+	switch ( event->keyval ) {
+
+	case GDK_KEY_B :
+	case GDK_KEY_b :
+		check_toggle_blank(p);
+		break;
+
+	case GDK_KEY_Page_Up :
+	case GDK_KEY_Up :
+		prev_slide_sig(NULL, p);
+		break;
+
+	case GDK_KEY_Page_Down :
+	case GDK_KEY_Down :
+		next_slide_sig(NULL, p);
+		break;
+
+	case GDK_KEY_Escape :
+		end_slideshow(p);
+		break;
+
+	}
+
+	return FALSE;
+}
+
+
+static gboolean ss_realize_sig(GtkWidget *w, struct presentation *p)
+{
+	GdkWindow *win;
+
+	win = gtk_widget_get_window(w);
+
+	p->blank_cursor = gdk_cursor_new(GDK_BLANK_CURSOR);
+	gdk_window_set_cursor(GDK_WINDOW(win), p->blank_cursor);
+
+	gtk_window_parse_geometry(GTK_WINDOW(w), p->ss_geom);
+
+	return FALSE;
+}
+
+
+void try_start_slideshow(struct presentation *p)
+{
+	GtkWidget *n;
+	GdkScreen *screen;
+	int n_monitors;
+	int i;
+
+	/* Presentation already running? */
+	if ( p->slideshow != NULL ) return;
+
+	p->ss_blank = 0;
+
+	n = gtk_window_new(GTK_WINDOW_TOPLEVEL);
+
+	p->ss_drawingarea = gtk_drawing_area_new();
+	gtk_container_add(GTK_CONTAINER(n), p->ss_drawingarea);
+
+	gtk_widget_set_can_focus(GTK_WIDGET(p->ss_drawingarea), TRUE);
+	gtk_widget_add_events(GTK_WIDGET(p->ss_drawingarea),
+	                      GDK_KEY_PRESS_MASK);
+
+	g_signal_connect(G_OBJECT(p->ss_drawingarea), "key-press-event",
+			 G_CALLBACK(ss_key_press_sig), p);
+	g_signal_connect(G_OBJECT(n), "destroy", G_CALLBACK(ss_destroy_sig), p);
+	g_signal_connect(G_OBJECT(n), "realize", G_CALLBACK(ss_realize_sig), p);
+
+	g_signal_connect(G_OBJECT(p->ss_drawingarea), "draw",
+			 G_CALLBACK(ss_draw_sig), p);
+
+	gtk_widget_grab_focus(GTK_WIDGET(p->ss_drawingarea));
+
+	screen = gdk_screen_get_default();
+	n_monitors = gdk_screen_get_n_monitors(screen);
+	for ( i=0; i<n_monitors; i++ ) {
+
+		GdkRectangle rect;
+		int w;
+
+		gdk_screen_get_monitor_geometry(screen, i, &rect);
+		snprintf(p->ss_geom, 255, "%ix%i+%i+%i",
+		         rect.width, rect.height, rect.x, rect.y);
+
+		w = rect.height * p->slide_width/p->slide_height;
+		if ( w > rect.width ) w = rect.width;
+		p->proj_slide_width = w;
+
+	} /* FIXME: Sensible (configurable) choice of monitor */
+
+	p->slideshow = n;
+	p->slideshow_linked = 1;
+	gtk_window_fullscreen(GTK_WINDOW(n));
+	gtk_widget_show_all(GTK_WIDGET(n));
+
+	//if ( p->prefs->open_notes ) open_notes(p);  FIXME!
+
+	p->cur_proj_slide = p->cur_edit_slide;
+}