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1 module dia.icanvas;
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0
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2
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26
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3 public {
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4 import tk.geometry;
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5 import tk.events;
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6 import cairo.Context;
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7 }
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8
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10
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9 interface Viewport {
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26
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10 void zoom_relative(in Point pixel_datum, in double factor);
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11 void pan_relative(in Vector pixel_displacement);
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12 void damage_model(in Rectangle area); // FIXME could be an inout parameter of the event handling, or a special scope Damage object that supports growth only
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13 void damage_pixel(in Rectangle area); // FIXME as above
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14
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17
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15 // FIXME not sure about these:
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16 double zoom() const;
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17 Point model_to_pixel(in Point model) const;
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18 Point pixel_to_model(in Point pixel) const;
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19 Vector model_to_pixel(in Vector model) const;
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20 Vector pixel_to_model(in Vector pixel) const;
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21 Rectangle model_to_pixel(in Rectangle model) const;
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22 Rectangle pixel_to_model(in Rectangle model) const;
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23 double model_to_pixel(in double model) const;
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24 double pixel_to_model(in double pixel) const;
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25 }
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26
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27 interface EventHandler {
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28 bool handle_button_press(scope Viewport viewport, in ButtonEvent event);
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29 bool handle_button_release(scope Viewport viewport, in ButtonEvent event);
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30 bool handle_motion(scope Viewport viewport, in MotionEvent event);
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31 bool handle_scroll(scope Viewport viewport, in ScrollEvent event);
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32 //bool handle_enter(scope Viewport viewport, CrossingEvent event);
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33 //bool handle_leave(scope Viewport viewport, CrossingEvent event);
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34 //bool handle_focus_in(scope Viewport viewport, FocusEvent event);
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35 //bool handle_focus_out(scope Viewport viewport, FocusEvent event);
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36 bool handle_key_press(scope Viewport viewport, in KeyEvent event);
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37 bool handle_key_release(scope Viewport viewport, in KeyEvent event);
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38 }
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39
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40 abstract class Layer {
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12
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41 this(in string name) {
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42 mName = name;
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43 }
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44
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45 string name() const { return mName; }
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46
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47 Rectangle bounds() const;
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48 //void zoom_changed
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49 void draw(in Viewport viewport,
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50 in Rectangle pixel_damage, scope Context pixel_cr,
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51 in Rectangle model_damage, scope Context model_cr) const;
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12
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52
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53 private {
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54 invariant string mName;
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55 }
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56 }
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