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Implement more of LdCanvas.

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1. Add methods for coordinate translation between cairo/GtkWidget
   coordinates and LdDocument coordinates.
2. Draw the grid correctly (also make it significantly faster).
3. Place the canvas into a GtkScrolledWindow and register
   the set_scroll_adjustments signal in the GtkWidget base class.
4. Allow scrolling inside of an area of 200 x 200 units (for now).
   In the future, it should be possible to go to infinity.
This commit is contained in:
Přemysl Eric Janouch
2010-12-07 00:59:05 +01:00
parent 37d898fb1a
commit 3419680f25
3 changed files with 337 additions and 60 deletions
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10
src/ld-window-main.c
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@@ -97,6 +97,8 @@ struct _LdWindowMainPrivate
GtkWidget *toolbar;
LdLibrary *library;
GtkWidget *canvas_window;
LdCanvas *canvas;
GtkWidget *statusbar;
@@ -270,10 +272,9 @@ ld_window_main_init (LdWindowMain *self)
/* TODO in the future: GtkHPaned */
/* Canvas. */
/* TODO: Put it into a GtkScrolledWindow. */
priv->canvas = ld_canvas_new ();
/* TODO: To be able to draw a symbol menu over the canvas, we may:
/* XXX: To be able to draw a symbol menu over the canvas, we may:
* 1. Hook the expose-event and button-{press,release}-event signals.
* 2. Create a hook mechanism in the LdCanvas object.
* + The cairo context would not have to be created twice.
@@ -297,7 +298,10 @@ ld_window_main_init (LdWindowMain *self)
g_signal_handler_block (priv->canvas,
priv->symbol_menu.button_release_handler);
gtk_box_pack_start (GTK_BOX (priv->hbox), GTK_WIDGET (priv->canvas),
priv->canvas_window = gtk_scrolled_window_new (NULL, NULL);
gtk_container_add (GTK_CONTAINER (priv->canvas_window),
GTK_WIDGET (priv->canvas));
gtk_box_pack_start (GTK_BOX (priv->hbox), GTK_WIDGET (priv->canvas_window),
TRUE, TRUE, 0);
priv->statusbar = gtk_statusbar_new ();