1 files changed, 264 insertions, 0 deletions
diff --git a/dw/layout.hh b/dw/layout.hh
new file mode 100644
index 00000000..13b8f312
--- /dev/null
+++ b/dw/layout.hh
@@ -0,0 +1,264 @@
+#ifndef __DW_LAYOUT_HH__
+#define __DW_LAYOUT_HH__
+
+#ifndef __INCLUDED_FROM_DW_CORE_HH__
+#   error Do not include this file directly, use "core.hh" instead.
+#endif
+
+namespace dw {
+namespace core {
+
+/**
+ * \brief The central class for managing and drawing a widget tree.
+ *
+ * \sa\ref dw-overview, \ref dw-layout-widgets, \ref dw-layout-views
+ */
+class Layout: public object::Object
+{
+   friend class Widget;
+
+public:
+   /**
+    * \brief Receiver interface different signals.
+    *
+    * May be extended
+    */
+   class Receiver: public lout::signal::Receiver
+   {
+   public:
+      virtual void canvasSizeChanged (int width, int ascent, int descent);
+   };
+
+private:
+   class Emitter: public lout::signal::Emitter
+   {
+   private:
+      enum { CANVAS_SIZE_CHANGED };
+
+   protected:
+      bool emitToReceiver (lout::signal::Receiver *receiver, int signalNo,
+                           int argc, Object **argv);
+
+   public:
+      inline void connectLayout (Receiver *receiver) { connect (receiver); }
+
+      void emitCanvasSizeChanged (int width, int ascent, int descent);
+   };
+
+   Emitter emitter;
+
+   class Anchor: public object::Object
+   {
+   public:
+      char *name;
+      Widget *widget;
+      int y;
+
+      ~Anchor ();
+   };
+
+   Platform *platform;
+   container::typed::List <View> *views;
+   Widget *topLevel, *widgetAtPoint;
+
+   /* The state, which must be projected into the views. */
+   style::Color *bgColor;
+   style::Cursor cursor;
+   int canvasWidth, canvasAscent, canvasDescent;
+
+   bool usesViewport;
+   int scrollX, scrollY, viewportWidth, viewportHeight;
+   bool canvasHeightGreater;
+   int hScrollbarThickness, vScrollbarThickness;
+   
+   HPosition scrollTargetHpos;
+   VPosition scrollTargetVpos;
+   int scrollTargetX, scrollTargetY, scrollTargetWidth, scrollTargetHeight;
+
+   char *requestedAnchor;
+   int scrollIdleId, resizeIdleId;
+   bool scrollIdleNotInterrupted;
+
+   /* Anchors of the widget tree */
+   container::typed::HashTable <object::String, Anchor> *anchorsTable;
+
+   SelectionState selectionState;
+   FindtextState findtextState;
+
+   enum ButtonEventType { BUTTON_PRESS, BUTTON_RELEASE, MOTION_NOTIFY };
+
+   Widget *getWidgetAtPoint (int x, int y);
+   void moveToWidget (Widget *newWidgetAtPoint, ButtonState state);
+
+   /**
+    * \brief Emit the necessary crossing events, when the mouse pointer has
+    *    moved to position (\em x, \em );
+    */
+   void moveToWidgetAtPoint (int x, int y, ButtonState state)
+   { moveToWidget (getWidgetAtPoint (x, y), state); }
+
+   /**
+    * \brief Emit the necessary crossing events, when the mouse pointer
+    * has moved out of the view.
+    */
+   void moveOutOfView (ButtonState state) { moveToWidget (NULL, state); }
+
+   bool processMouseEvent (MousePositionEvent *event, ButtonEventType type,
+                           bool mayBeSuppressed);
+   bool buttonEvent (ButtonEventType type, View *view,
+                     int numPressed, int x, int y, ButtonState state,
+                     int button);
+   void resizeIdle ();
+   void setSizeHints ();
+   void draw (View *view, Rectangle *area);
+
+   void scrollTo0(HPosition hpos, VPosition vpos,
+                  int x, int y, int width, int height,
+                  bool scrollingInterrupted);
+   void scrollIdle ();
+   void adjustScrollPos ();
+   static bool calcScrollInto (int targetValue, int requestedSize,
+                               int *value, int viewportSize);
+
+   void updateAnchor ();
+
+   /* Widget */
+
+   char *addAnchor (Widget *widget, const char* name);
+   char *addAnchor (Widget *widget, const char* name, int y);
+   void changeAnchor (Widget *widget, char* name, int y);
+   void removeAnchor (Widget *widget, char* name);
+   void setCursor (style::Cursor cursor);
+   void updateCursor ();
+   void updateBgColor ();
+   void queueDraw (int x, int y, int width, int height);
+   void queueDrawExcept (int x, int y, int width, int height,
+      int ex, int ey, int ewidth, int eheight);
+   void queueResize ();
+   void removeWidget ();
+  
+public:
+   Layout (Platform *platform);
+   ~Layout ();
+
+   misc::ZoneAllocator *textZone;
+   
+   void addWidget (Widget *widget);
+   void setWidget (Widget *widget);
+
+   void attachView (View *view);
+   void detachView (View *view);
+
+   inline bool getUsesViewport () { return usesViewport; }
+   inline int getWidthViewport () { return viewportWidth; }
+   inline int getHeightViewport ()  { return viewportHeight; }
+   inline int getScrollPosX ()  { return scrollX; }
+   inline int getScrollPosY ()  { return scrollY; }
+
+   /* public */
+
+   void scrollTo (HPosition hpos, VPosition vpos,
+                  int x, int y, int width, int height);
+   void setAnchor (const char *anchor);
+
+   /* View */
+
+   inline void expose (View *view, Rectangle *area) { draw (view, area); }
+
+   /**
+    * \brief This function is called by a view, to delegate a button press
+    * event.
+    * 
+    * \em numPressed is 1 for simple presses, 2 for double presses etc. (more
+    * that 2 is never needed), \em x and \em y the world coordinates, and
+    * \em button the number of the button pressed.
+    */
+   inline bool buttonPress (View *view, int numPressed, int x, int y,
+                            ButtonState state, int button)
+   {
+      return buttonEvent (BUTTON_PRESS, view, numPressed, x, y, state, button);
+   }
+
+   /**
+    * \brief This function is called by a view, to delegate a button press
+    * event.
+    *
+    * Arguments are similar to dw::core::Layout::buttonPress.
+    */
+   inline bool buttonRelease (View *view, int numPressed, int x, int y,
+                              ButtonState state, int button)
+   {
+      return buttonEvent (BUTTON_RELEASE, view, numPressed, x, y, state,
+                          button);
+   }
+
+   bool motionNotify (View *view,  int x, int y, ButtonState state);
+   void enterNotify (View *view, int x, int y, ButtonState state);
+   void leaveNotify (View *view, ButtonState state);
+
+   void scrollPosChanged (View *view, int x, int y);
+   void viewportSizeChanged (View *view, int width, int height);
+
+   /* delegated */
+
+   inline int textWidth (style::Font *font, const char *text, int len)
+   {
+      return platform->textWidth (font, text, len);
+   }
+
+   inline int nextGlyph (const char *text, int idx)
+   {
+      return platform->nextGlyph (text, idx);
+   }
+
+   inline int prevGlyph (const char *text, int idx)
+   {
+      return platform->prevGlyph (text, idx);
+   }
+
+   inline style::Font *createFont (style::FontAttrs *attrs, bool tryEverything)
+   {
+      return  platform->createFont (attrs, tryEverything);
+   }
+
+   inline style::Color *createSimpleColor (int color)
+   {
+      return platform->createSimpleColor (color);
+   }
+
+   inline style::Color *createShadedColor (int color)
+   {
+      return platform->createShadedColor (color);
+   }
+
+   inline Imgbuf *createImgbuf (Imgbuf::Type type, int width, int height)
+   {
+      return platform->createImgbuf (type, width, height);
+   }
+
+   inline void copySelection(const char *text)
+   {
+      platform->copySelection(text);
+   }
+
+   inline ui::ResourceFactory *getResourceFactory ()
+   {
+      return platform->getResourceFactory ();
+   }
+
+   inline void connect (Receiver *receiver) {
+      emitter.connectLayout (receiver); }
+
+   /** \brief See dw::core::FindtextState::search. */
+   inline FindtextState::Result search (const char *str, bool caseSens)
+      { return findtextState.search (str, caseSens); }
+
+   /** \brief See dw::core::FindtextState::resetSearch. */
+   inline void resetSearch () { findtextState.resetSearch (); }
+};
+
+} // namespace dw
+} // namespace core
+
+#endif // __DW_LAYOUT_HH__
+