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22
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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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27
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9 private {
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10 import std.typecons;
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11 }
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12
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13 mixin(defineEnum!("Cursor",
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14 "DEFAULT", "HAND", "CROSSHAIR"));
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15
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10
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16 interface Viewport {
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26
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17 void zoom_relative(in Point pixel_datum, in double factor);
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18 void pan_relative(in Vector pixel_displacement);
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27
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19 void set_cursor(in Cursor cursor);
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20 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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21 void damage_pixel(in Rectangle area); // FIXME as above
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10
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22
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23 /*
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24 // FIXME not sure about these:
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25 double zoom() const;
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26 Point model_to_pixel(in Point model) const;
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27 Point pixel_to_model(in Point pixel) const;
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28 Vector model_to_pixel(in Vector model) const;
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29 Vector pixel_to_model(in Vector pixel) const;
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30 Rectangle model_to_pixel(in Rectangle model) const;
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31 Rectangle pixel_to_model(in Rectangle model) const;
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32 double model_to_pixel(in double model) const;
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33 double pixel_to_model(in double pixel) const;
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34 */
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35 }
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36
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10
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37 interface EventHandler {
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38 bool handle_button_press(scope Viewport viewport, in ButtonEvent event);
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39 bool handle_button_release(scope Viewport viewport, in ButtonEvent event);
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40 bool handle_motion(scope Viewport viewport, in MotionEvent event);
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41 bool handle_scroll(scope Viewport viewport, in ScrollEvent event);
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42 //bool handle_enter(scope Viewport viewport, CrossingEvent event);
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43 //bool handle_leave(scope Viewport viewport, CrossingEvent event);
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44 //bool handle_focus_in(scope Viewport viewport, FocusEvent event);
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45 //bool handle_focus_out(scope Viewport viewport, FocusEvent event);
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46 bool handle_key_press(scope Viewport viewport, in KeyEvent event);
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47 bool handle_key_release(scope Viewport viewport, in KeyEvent event);
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48 }
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49
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50 abstract class Layer {
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12
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51 this(in string name) {
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52 mName = name;
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53 }
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54
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55 string name() const { return mName; }
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56
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11
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57 Rectangle bounds() const;
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58 //void zoom_changed
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59 void draw(in Viewport viewport,
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19
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60 in Rectangle pixel_damage, scope Context pixel_cr,
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61 in Rectangle model_damage, scope Context model_cr) const;
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12
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62
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63 private {
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64 invariant string mName;
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65 }
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10
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66 }
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