/**
* ppg_ruler_size_allocate:
* @ruler: (in): A #PpgRuler.
*
* Handle the "size-allocate" for the #GtkWidget. The pixmap for the
* background is created and drawn if necessary.
*
* Returns: None.
* Side effects: None.
*/
static void
ppg_ruler_size_allocate (GtkWidget *widget,
GtkAllocation *alloc)
{
PpgRuler *ruler = (PpgRuler *)widget;
PpgRulerPrivate *priv;
GdkColormap *colormap;
GdkVisual *visual;
g_return_if_fail(PPG_IS_RULER(ruler));
priv = ruler->priv;
GTK_WIDGET_CLASS(ppg_ruler_parent_class)->size_allocate(widget, alloc);
if (priv->ruler) {
g_object_unref(priv->ruler);
}
priv->ruler = gdk_pixmap_new(NULL, alloc->width, alloc->height, 32);
visual = gdk_visual_get_best_with_depth(32);
colormap = gdk_colormap_new(visual, FALSE);
gdk_drawable_set_colormap(priv->ruler, colormap);
if (GTK_WIDGET_DRAWABLE(widget)) {
ppg_ruler_draw_ruler(ruler);
}
}
/**
* ppg_ruler_size_allocate:
* @ruler: (in): A #PpgRuler.
*
* Handle the "size-allocate" for the #GtkWidget. The pixmap for the
* background is created and drawn if necessary.
*
* Returns: None.
* Side effects: None.
*/
static void
ppg_ruler_size_allocate (GtkWidget *widget,
GtkAllocation *alloc)
{
PpgRuler *ruler = (PpgRuler *)widget;
PpgRulerPrivate *priv;
GdkWindow *window;
g_return_if_fail(PPG_IS_RULER(ruler));
priv = ruler->priv;
GTK_WIDGET_CLASS(ppg_ruler_parent_class)->size_allocate(widget, alloc);
if (priv->ruler) {
cairo_surface_destroy(priv->ruler);
}
if (gtk_widget_is_drawable(widget)) {
window = gtk_widget_get_window(widget);
priv->ruler = gdk_window_create_similar_surface(window,
CAIRO_CONTENT_COLOR_ALPHA,
alloc->width,
alloc->height);
ppg_ruler_draw_ruler(ruler);
}
}
/**
* ppg_ruler_expose_event:
* @ruler: (in): A #PpgRuler.
*
* Handle the "expose-event" for the widget. Blit the background and position
* arrow to the surface.
*
* Returns: None.
* Side effects: None.
*/
static gboolean
ppg_ruler_expose_event (GtkWidget *widget,
GdkEventExpose *expose)
{
PpgRuler *ruler = (PpgRuler *)widget;
PpgRulerPrivate *priv;
GtkAllocation alloc;
cairo_t *cr;
gint x;
gint y;
g_return_val_if_fail(PPG_IS_RULER(ruler), FALSE);
GTK_WIDGET_CLASS(ppg_ruler_parent_class)->expose_event(widget, expose);
priv = ruler->priv;
gtk_widget_get_allocation(widget, &alloc);
cr = gdk_cairo_create(expose->window);
/*
* Clip to exposure region.
*/
gdk_cairo_rectangle(cr, &expose->area);
cairo_clip(cr);
/*
* Render the contents immediately if needed.
*/
if (priv->dirty) {
ppg_ruler_draw_arrow(ruler);
ppg_ruler_draw_ruler(ruler);
priv->dirty = FALSE;
}
/*
* Blit the background to the surface.
*/
cairo_rectangle(cr, 0, 0, alloc.width, alloc.height);
gdk_cairo_set_source_pixmap(cr, priv->ruler, 0, 0);
cairo_fill(cr);
/*
* Blit the arrow to the surface.
*/
x = (gint)(((priv->pos - priv->lower) /
(priv->upper - priv->lower) *
alloc.width) - (ARROW_SIZE / 2.0));
y = alloc.height - ARROW_SIZE - 1;
gdk_cairo_set_source_pixmap(cr, priv->arrow, x, y);
cairo_rectangle(cr, x, y, ARROW_SIZE, ARROW_SIZE);
cairo_fill(cr);
/*
* Cleanup.
*/
cairo_destroy(cr);
return FALSE;
}
/**
* ppg_ruler_draw:
* @ruler: (in): A #PpgRuler.
* @cr: (in): A #cairo_t to draw to.
*
* Handle the "draw" event for the widget. Blit the background and position
* arrow to the surface.
*
* Returns: FALSE always.
* Side effects: None.
*/
static gboolean
ppg_ruler_draw (GtkWidget *widget,
cairo_t *cr)
{
PpgRuler *ruler = (PpgRuler *)widget;
PpgRulerPrivate *priv;
GtkAllocation alloc;
gboolean ret;
gint x;
gint y;
g_return_val_if_fail(PPG_IS_RULER(ruler), FALSE);
#if GTK_CHECK_VERSION(2, 91, 0)
ret = GTK_WIDGET_CLASS(ppg_ruler_parent_class)->draw(widget, cr);
#else
ret = GTK_WIDGET_CLASS(ppg_ruler_parent_class)->
expose_event(widget, (GdkEventExpose *)gtk_get_current_event());
#endif
priv = ruler->priv;
gtk_widget_get_allocation(widget, &alloc);
/*
* Render the contents immediately if needed.
*/
if (priv->dirty) {
ppg_ruler_draw_arrow(ruler);
ppg_ruler_draw_ruler(ruler);
priv->dirty = FALSE;
}
/*
* Blit the background to the surface.
*/
cairo_rectangle(cr, 0, 0, alloc.width, alloc.height);
cairo_set_source_surface(cr, priv->ruler, 0, 0);
cairo_fill(cr);
/*
* Blit the arrow to the surface.
*/
x = (gint)(((priv->pos - priv->lower) /
(priv->upper - priv->lower) *
alloc.width) - (ARROW_SIZE / 2.0));
y = alloc.height - ARROW_SIZE - 1;
cairo_set_source_surface(cr, priv->arrow, x, y);
cairo_rectangle(cr, x, y, ARROW_SIZE, ARROW_SIZE);
cairo_fill(cr);
return ret;
}
static gboolean
ppg_ruler_expose_event (GtkWidget *widget,
GdkEventExpose *expose)
{
PpgRuler *ruler = (PpgRuler *)widget;
PpgRulerPrivate *priv;
GtkAllocation alloc;
cairo_t *cr;
gint x;
gint y;
g_return_val_if_fail(PPG_IS_RULER(ruler), FALSE);
GTK_WIDGET_CLASS(ppg_ruler_parent_class)->expose_event(widget, expose);
priv = ruler->priv;
gtk_widget_get_allocation(widget, &alloc);
cr = gdk_cairo_create(expose->window);
if (priv->dirty) {
ppg_ruler_draw_arrow(ruler);
ppg_ruler_draw_ruler(ruler);
priv->dirty = FALSE;
}
cairo_rectangle(cr, 0, 0, alloc.width, alloc.height);
gdk_cairo_set_source_pixmap(cr, priv->ruler, 0, 0);
cairo_fill(cr);
x = (gint)(((priv->pos - priv->lower) /
(priv->upper - priv->lower) *
alloc.width) - (ARROW_SIZE / 2.0));
y = alloc.height - ARROW_SIZE - 1;
gdk_cairo_set_source_pixmap(cr, priv->arrow, x, y);
cairo_rectangle(cr, x, y, ARROW_SIZE, ARROW_SIZE);
cairo_fill(cr);
cairo_destroy(cr);
return FALSE;
}
