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view icanvas.d @ 17:c643c04e3f5e
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author | David Bryant <daveb@acres.com.au> |
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date | Mon, 13 Jul 2009 16:46:21 +0930 |
parents | 9e63308b749c |
children | df8d81d9f499 |
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module icanvas; import tk.geometry; import tk.events; import cairo.Context; interface Viewport { void rel_zoom(Point pixel_datum, double factor); void rel_pan(Vector pixel_displacement); void damage_model(Rectangle area); // FIXME could be an inout parameter of the event handling, or a special scope Damage object that supports growth only // FIXME not sure about these: double zoom() const; Point model_to_pixel(Point model) const; Point pixel_to_model(Point pixel) const; Vector model_to_pixel(Vector model) const; Vector pixel_to_model(Vector pixel) const; Rectangle model_to_pixel(Rectangle model) const; Rectangle pixel_to_model(Rectangle model) const; double model_to_pixel(double model) const; double pixel_to_model(double pixel) const; } interface EventHandler { bool handle_button_press(Viewport viewport, in ButtonEvent event); bool handle_button_release(Viewport viewport, in ButtonEvent event); bool handle_motion(Viewport viewport, in MotionEvent event); bool handle_scroll(Viewport viewport, in ScrollEvent event); //bool handle_expose(Viewport viewport, ExposeEvent event); //bool handle_enter(Viewport viewport, CrossingEvent event); //bool handle_leave(Viewport viewport, CrossingEvent event); //bool handle_focus_in(Viewport viewport, FocusEvent event); //bool handle_focus_out(Viewport viewport, FocusEvent event); bool handle_key_press(Viewport viewport, in KeyEvent event); bool handle_key_release(Viewport viewport, in KeyEvent event); } abstract class Layer { this(in string name) { mName = name; } string name() const { return mName; } Rectangle bounds() const; //void zoom_changed void draw(const Viewport viewport, in Rectangle damage, Context model_cr, Context pixel_cr) const; private { invariant string mName; } }