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- modified cairo_widget and simulation_widget to support scaling 

git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@908 3ecf2c5c-341e-0410-92b4-d18e462d057c
This commit is contained in:
paolo 2006-08-18 19:54:24 +00:00
parent df24fafb06
commit e4c269f5d4
5 changed files with 93 additions and 142 deletions
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163
src/cairo_widget.cc
View File

@ -19,23 +19,13 @@
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
/*
the widget's event sequence...
on_size_request, requisition->width : 0, requisition->height : 0
on_realize, alloc.get_width() : 673, alloc.get_height() : 485
on_expose_event START... on_expose_event CONTINUE.
on_size_request, requisition->width : 120, requisition->height : 120
on_expose_event START... on_expose_event CONTINUE.
on_expose_event START... on_expose_event CONTINUE.
et cetera...
*/
#include "cairo_elements.hh"
#include "cairo_widget.hh"
#include <gdkmm/window.h>
#include <cassert>
#include <iostream>
#include <memory>
@ -45,7 +35,8 @@ using namespace sgpem;
CairoWidget::CairoWidget()
: Glib::ObjectBase("sgpem_CairoWidget"),
Gtk::Widget(), _draw_w(1), _draw_h(1), _buf(NULL),
Gtk::Widget(),
_draw_w(1), _draw_h(1), _buf(NULL),
_client_w(0), _client_h(0), _pixmap_w(0), _pixmap_h(0),
_need_redraw(true), _scaling_mode(scaling_none)
{
@ -62,35 +53,6 @@ CairoWidget::set_scaling_mode(CairoWidget::scaling_mode scaling)
{
CairoWidget::scaling_mode old_scaling = _scaling_mode;
_scaling_mode = scaling;
/*
if(_scaling_mode==scaling_none)
set_size_request(_draw_w, _draw_h);
else
set_size_request(_client_w, _client_h);
*/
switch(_scaling_mode)
{
case scaling_none:
set_size_request(100, 100);
break;
case scaling_to_w:
set_size_request(150, 150);
break;
case scaling_to_h:
set_size_request(200, 200);
break;
case scaling_min:
set_size_request(250, 250);
break;
case scaling_max:
set_size_request(300, 300);
break;
case scaling_all:
set_size_request(350, 350);
break;
}
return old_scaling;
}
@ -100,11 +62,10 @@ CairoWidget::get_scaling_mode()
return _scaling_mode;
}
void
CairoWidget::on_realize()
{
std::cout << " on_realize" << std::endl;
// std::cout << " on_realize" << std::endl;
if (is_realized()) return;
Gtk::Widget::on_realize();
@ -120,7 +81,7 @@ CairoWidget::on_realize()
attributes.width = alloc.get_width();
attributes.height = alloc.get_height();
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.event_mask = get_events() | GDK_EXPOSURE_MASK;
attributes.event_mask = get_events() | GDK_EXPOSURE_MASK | GDK_ALL_EVENTS_MASK;
attributes.window_type = GDK_WINDOW_CHILD;
attributes.visual = get_visual()->gobj();
attributes.colormap = get_colormap()->gobj();
@ -128,7 +89,7 @@ CairoWidget::on_realize()
_client_w = alloc.get_width();
_client_h = alloc.get_height();
std::cout << " on_realize, alloc.get_width() : " << alloc.get_width() << ", alloc.get_height() : " << alloc.get_height() << std::endl;
// std::cout << " on_realize, alloc.get_width() : " << alloc.get_width() << ", alloc.get_height() : " << alloc.get_height() << std::endl;
static const gint attributes_mask = Gdk::WA_X | Gdk::WA_Y | Gdk::WA_WMCLASS
| Gdk::WA_VISUAL | Gdk::WA_COLORMAP;
@ -146,11 +107,10 @@ CairoWidget::on_realize()
get_style()->set_background(window, Gtk::STATE_ACTIVE);
}
void
CairoWidget::on_size_allocate(const Gtk::Allocation& allocation)
{
std::cout << " on_size_allocate, allocation.get_width() : " << allocation.get_width() << ", allocation.get_height() : " << allocation.get_height() << std::endl;
// std::cout << " on_size_allocate, allocation.get_width() : " << allocation.get_width() << ", allocation.get_height() : " << allocation.get_height() << std::endl;
set_allocation(allocation);
if (is_realized())
@ -169,68 +129,59 @@ CairoWidget::on_size_request(Gtk::Requisition* requisition)
{
// Gtk+ asks the desired widget dimension
std::cout << " on_size_request, requisition->width : " << requisition->width << ", requisition->height : " << requisition->height << std::endl;
// the response is - what allocated before...
/*
switch(_scaling_mode)
{
case scaling_none:
*requisition = Gtk::Requisition();
requisition->width = _draw_w;
requisition->height = _draw_h;
break;
case scaling_to_w:
case scaling_to_h:
case scaling_min:
case scaling_max:
case scaling_all:
Glib::RefPtr<Gdk::Window>parent_w = get_parent_window();
if(parent_w)
{
int w, h;
parent_w->get_size(w, h);
requisition->width = w;
requisition->height = h;
}
break;
}
*/
// std::cout << " on_size_request, requisition->width : " << requisition->width << ", requisition->height : " << requisition->height << std::endl;
calc_widget_size(_client_w, _client_h);
requisition->width = _client_w;
requisition->height = _client_h;
}
bool
CairoWidget::on_expose_event(GdkEventExpose* event)
{
std::cout << " on_expose_event START...";
// std::cout << " on_expose_event START...";
if (event == NULL || event->count > 0)
return false;
std::cout << " on_expose_event CONTINUE." << std::endl;
// std::cout << " on_expose_event CONTINUE." << std::endl;
if(_need_redraw)
int actual_w = get_width();
int actual_h = get_height();
// std::cout << " get_width() : " << actual_w << ", get_height() : " << actual_h << std::endl;
// std::cout << " _client_w : " << _client_w << ", _client_h : " << _client_h << std::endl;
// std::cout << " _pixmap_w : " << _pixmap_w << ", _pixmap_h : " << _pixmap_h << std::endl;
if(_need_redraw || actual_w!=_client_w || actual_h!=_client_h)
{
_need_redraw = false;
_client_w = actual_w;
_client_h = actual_h;
// lazy technique: allocate only if growing...
if(_client_w>_pixmap_w || _client_h>_pixmap_h)
{
std::cout << " on_expose_event CREATE Pixmap." << std::endl;
_buf = Gdk::Pixmap::create(get_window(), _client_w, _client_h);
_pixmap_w = _client_w;
_pixmap_h = _client_h;
// previdence in the code: allocate more than actually needed
_pixmap_w = (size_t) (_client_w*1.2);
_pixmap_h = (size_t) (_client_h*1.2);
std::cout << " on_expose_event CREATE Pixmap. w : " << _pixmap_w << ", h : " << _pixmap_h<< std::endl;
_buf = Gdk::Pixmap::create(get_window(), _pixmap_w, _pixmap_h);
}
// Draw the widget background as the first thing.
// I've seen this is how it's done in the very Gtk+ toolkit
// for the GtkProgressBar widget.
GtkStyle* gStyle = get_style()->gobj();
std::cout << " on_expose_event gtk_paint_box." << std::endl;
// std::cout << " on_expose_event gtk_paint_box." << std::endl;
gtk_paint_box(gStyle, _buf->gobj(),
GTK_STATE_NORMAL, GTK_SHADOW_ETCHED_IN,
NULL, this->gobj(), "through",
NULL, (GtkWidget*)this->gobj(), "through",
0, 0, _client_w, _client_h);
cairo_t* ctx = gdk_cairo_create(_buf->gobj());
// Determine the final drawing dimensions before to start drawing
calc_size(_draw_w, _draw_h);
_draw_w = _draw_h = 0; // default no scaling
calc_drawing_size(_draw_w, _draw_h);
// do the drawing...
if(_scaling_mode!=scaling_none && _draw_w>0 && _draw_h>0)
{
@ -265,7 +216,7 @@ CairoWidget::on_expose_event(GdkEventExpose* event)
}
cairo_scale(ctx, sx, sy);
}
std::cout << " on_expose_event Dimensions, w : " << _draw_w << ", h : " << _draw_h << std::endl;
// std::cout << " on_expose_event Dimensions, w : " << _draw_w << ", h : " << _draw_h << std::endl;
draw_widget(ctx);
cairo_destroy(ctx);
}
@ -287,10 +238,7 @@ CairoWidget::on_expose_event(GdkEventExpose* event)
bool
CairoWidget::on_button_press_event(GdkEventButton* event)
{
std::cout << " on_button_press_event " << std::endl;
change_scaling_mode();
// Not here. Yet.
return true;
return false;
}
void
@ -301,42 +249,13 @@ CairoWidget::redraw()
queue_draw();
}
void
CairoWidget::change_scaling_mode()
{
std::cout << " change_scaling_mode " << std::endl;
switch(_scaling_mode)
void
CairoWidget::calc_drawing_size(size_t& width, size_t& height) const
{
case scaling_none:
set_scaling_mode(scaling_to_w);
break;
case scaling_to_w:
case scaling_to_h:
case scaling_min:
case scaling_max:
set_scaling_mode((scaling_mode)(_scaling_mode << 1));
break;
case scaling_all:
set_scaling_mode(scaling_none);
break;
}
redraw();
/* switch(_scaling_mode)
void
CairoWidget::calc_widget_size(size_t& width, size_t& height) const
{
case scaling_none:
_scaling_mode = scaling_to_w;
break;
case scaling_to_w:
case scaling_to_h:
case scaling_min:
case scaling_max:
_scaling_mode = (scaling_mode)(_scaling_mode << 1);
break;
case scaling_all:
_scaling_mode = scaling_none;
break;
}
redraw();
*/
}

8
src/cairo_widget.hh
View File

@ -24,6 +24,7 @@
#include "config.h"
#include <cairo.h>
#include <gtkmm/drawingarea.h>
#include <gtkmm/widget.h>
#include <gdkmm/pixmap.h>
@ -60,8 +61,11 @@ namespace sgpem
// in this method the implemented widget must "do the things"
virtual void draw_widget(cairo_t* ctx) = 0;
// with this method CairoWidget the needed drawing dimensions
virtual void calc_size(size_t& width, size_t& height) const = 0;
// with this method CairoWidget tells the needed drawing dimensions
virtual void calc_drawing_size(size_t& width, size_t& height) const;
// with this method CairoWidget tells the needed widgwt dimensions
virtual void calc_widget_size(size_t& width, size_t& height) const;
void redraw();

4
src/gui_builder.cc
View File

@ -130,7 +130,7 @@ GuiBuilder::on_file_open_activate()
void
GuiBuilder::on_file_save_activate()
{
_simulation_widget->change_scaling_mode();
// _simulation_widget->change_scaling_mode();
}
void
@ -258,12 +258,14 @@ GuiBuilder::GuiBuilder(const std::string& gladefile)
// Main simulation widget
ScrolledWindow* simulation_window = NULL;
_refXml->get_widget("SimulationScrolledWindow", simulation_window);
_simulation_widget = new SimulationWidget();
SimulationWidget* simulation_widget = manage(_simulation_widget);
simulation_window->add(*simulation_widget);
simulation_widget->show();
}

45
src/simulation_widget.cc
View File

@ -117,21 +117,44 @@ SimulationWidget::draw_widget(cairo_t* ctx)
void
SimulationWidget::calc_size(size_t& width, size_t& height) const
SimulationWidget::calc_drawing_size(size_t& width, size_t& height) const
{
// FIXME: write me
// some magic here!
width = 300;
height = 350;
width = 150;
height = 150;
}
/*
void
SimulationWidget::calc_size(const History& history, size_t& width, size_t& height) const
bool
SimulationWidget::on_button_press_event(GdkEventButton* event)
{
// FIXME: write me
width = get_allocation().get_width();
height = get_allocation().get_height();
std::cout << " on_button_press_event " << std::endl;
change_scaling_mode();
// Not here. Yet.
return true;
}
void
SimulationWidget::change_scaling_mode()
{
std::cout << " change_scaling_mode " << std::endl;
scaling_mode scaling = get_scaling_mode();
switch(scaling)
{
case scaling_none:
set_scaling_mode(scaling_to_w);
break;
case scaling_to_w:
case scaling_to_h:
case scaling_min:
case scaling_max:
set_scaling_mode((scaling_mode)(scaling << 1));
break;
case scaling_all:
set_scaling_mode(scaling_none);
break;
}
redraw();
}
*/

5
src/simulation_widget.hh
View File

@ -36,9 +36,12 @@ namespace sgpem
void update(const History& history);
protected:
virtual bool on_button_press_event(GdkEventButton* event);
void change_scaling_mode();
void draw_widget(cairo_t* ctx);
virtual void calc_size(size_t& width, size_t& height) const;
virtual void calc_drawing_size(size_t& width, size_t& height) const;
// void calc_size(const History& history, size_t& width, size_t& height) const;
private:
int _n_update;