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port-to-gtk3: Use draw signal in the partition info dialog (#7) 

In Gtk2 widgets draw themselves in response to the expose event signal.
In Gtk3 widgets draw themselves in response to the GtkWidget::draw
signal, and the signal handler gets a Cairo context as an argument.

Convert Gtk::DrawingArea rendering code to respond to the
GtkWidget::draw signal.

This commit is specific to the drawing area in the Partition Info
dialog.

Reference:

[1] Migrating from GTK+ 2.x to GTK+ 3 - "The GtkWidget::draw signal":
    https://developer.gnome.org/gtk3/stable/ch26s02.html#id-1.6.3.4.11

Closes #7 - Port to Gtk3
This commit is contained in:
Luca Bacci 2018-08-03 19:25:57 +02:00 committed by Mike Fleetwood
parent e3f77966c9
commit 4c1fe3bf7a
2 changed files with 4 additions and 15 deletions
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2
include/Dialog_Partition_Info.h
View File

@ -46,7 +46,7 @@ private:
void Display_Info();
// Signal handler
bool drawingarea_on_expose( GdkEventExpose *ev );
bool drawingarea_on_draw(const Cairo::RefPtr<Cairo::Context>& cr);
const Partition & partition; // (Alias to element in Win_GParted::display_partitions[] vector).

17
src/Dialog_Partition_Info.cc
View File

@ -118,19 +118,8 @@ Dialog_Partition_Info::Dialog_Partition_Info( const Partition & partition ) : pa
}
bool Dialog_Partition_Info::drawingarea_on_expose( GdkEventExpose *ev )
bool Dialog_Partition_Info::drawingarea_on_draw(const Cairo::RefPtr<Cairo::Context>& cr)
{
Glib::RefPtr<Gdk::Window> window = drawingarea.get_window();
if (!window)
return true;
Cairo::RefPtr<Cairo::Context> cr = window->create_cairo_context();
// Clip to the area indicated by the expose event so that we only redraw
// the portion of the window that needs to be redrawn.
cr->rectangle(ev->area.x, ev->area.y, ev->area.width, ev->area.height);
cr->clip();
Gdk::Cairo::set_source_color(cr, color_partition);
cr->rectangle(0, 0, 400, 60);
cr->fill();
@ -173,8 +162,8 @@ bool Dialog_Partition_Info::drawingarea_on_expose( GdkEventExpose *ev )
void Dialog_Partition_Info::init_drawingarea()
{
drawingarea .set_size_request( 400, 60 ) ;
drawingarea .signal_expose_event().connect( sigc::mem_fun(*this, &Dialog_Partition_Info::drawingarea_on_expose) ) ;
drawingarea.signal_draw().connect(sigc::mem_fun(*this, &Dialog_Partition_Info::drawingarea_on_draw));
frame = manage( new Gtk::Frame() ) ;
frame ->add( drawingarea ) ;