1 files changed, 171 insertions, 0 deletions
diff --git a/dw/platform.hh b/dw/platform.hh
new file mode 100644
index 0000000..227cda3
--- /dev/null
+++ b/dw/platform.hh
@@ -0,0 +1,171 @@
+#ifndef __DW_PLATFORM_HH__
+#define __DW_PLATFORM_HH__
+
+#ifndef __INCLUDED_FROM_DW_CORE_HH__
+#   error Do not include this file directly, use "core.hh" instead.
+#endif
+
+namespace dw {
+namespace core {
+
+/**
+ * \brief An interface to encapsulate some platform dependencies.
+ *
+ * \sa\ref dw-overview
+ */
+class Platform: public lout::object::Object
+{
+public:
+   /*
+    * -----------------------------------
+    *    General
+    * -----------------------------------
+    */
+
+   /**
+    * \brief This methods notifies the platform, that it has been attached to
+    *    a layout.
+    */
+   virtual void setLayout (Layout *layout) = 0;
+
+   /*
+    * -------------------------
+    *    Operations on views
+    * -------------------------
+    */
+
+   /**
+    * \brief This methods notifies the platform, that a view has been attached
+    *    to the related layout.
+    */
+   virtual void attachView (View *view) = 0;
+
+   /**
+    * \brief This methods notifies the platform, that a view has been detached
+    *    from the related layout.
+    */
+   virtual void detachView (View *view) = 0;
+
+   /*
+    * -----------------------------------
+    *    Platform dependent properties
+    * -----------------------------------
+    */
+
+   /**
+    * \brief Return the width of a text, with a given length and font.
+    */
+   virtual int textWidth (style::Font *font, const char *text, int len) = 0;
+
+   /**
+    * \brief Return the string resulting from transforming text to uppercase.
+    */
+   virtual char *textToUpper (const char *text, int len) = 0;
+
+   /**
+    * \brief Return the string resulting from transforming text to lowercase.
+    */
+   virtual char *textToLower (const char *text, int len) = 0;
+
+   /**
+    * \brief Return the index of the next glyph in string text.
+    */
+   virtual int nextGlyph (const char *text, int idx) = 0;
+
+   /**
+    * \brief Return the index of the previous glyph in string text.
+    */
+   virtual int prevGlyph (const char *text, int idx) = 0;
+
+   /**
+    * \brief Return screen resolution in x-direction.
+    */
+   virtual float dpiX () = 0;
+
+   /**
+    * \brief Return screen resolution in y-direction.
+    */
+   virtual float dpiY () = 0;
+
+   /*
+    * ---------------------------------------------------------
+    *    These are to encapsulate some platform dependencies
+    * ---------------------------------------------------------
+    */
+
+   /**
+    * \brief Add an idle function.
+    *
+    * An idle function is called once, when no other
+    * tasks are to be done (e.g. there are no events to process), and then
+    * removed from the queue. The return value is a number, which can be
+    * used in removeIdle below.
+    */
+   virtual int addIdle (void (Layout::*func) ()) = 0;
+
+   /**
+    * \brief Remove an idle function, which has not been processed yet.
+    */
+   virtual void removeIdle (int idleId) = 0;
+
+   /*
+    * ---------------------
+    *    Style Resources
+    * ---------------------
+    */
+
+   /**
+    * \brief Create a (platform dependent) font.
+    *
+    * Typically, within a platform, a sub class of dw::core::style::Font
+    * is defined, which holds more platform dependent data.
+    *
+    * Also, this method must fill the attributes "font" (when needed),
+    * "ascent", "descent", "spaceSidth" and "xHeight". If "tryEverything"
+    * is true, several methods should be used to use another font, when
+    * the requested font is not available. Passing false is typically done,
+    * if the caller wants to test different variations.
+    */
+   virtual style::Font *createFont (style::FontAttrs *attrs,
+                                    bool tryEverything) = 0;
+
+   virtual bool fontExists (const char *name) = 0;
+
+   /**
+    * \brief Create a color resource for a given 0xrrggbb value.
+    */
+   virtual style::Color *createColor (int color) = 0;
+
+   /**
+    * \brief Create a tooltip
+    */
+   virtual style::Tooltip *createTooltip (const char *text) = 0;
+
+   /**
+    * \brief Cancel a tooltip (either shown or requested)
+    */
+   virtual void cancelTooltip () = 0;
+
+   /**
+    * \brief Create a (platform speficic) image buffer.
+    *
+    * "gamma" is the value by which the image data is gamma-encoded.
+    */
+   virtual Imgbuf *createImgbuf (Imgbuf::Type type, int width, int height,
+                                 double gamma) = 0;
+
+   /**
+    * \brief Copy selected text (0-terminated).
+    */
+   virtual void copySelection(const char *text) = 0;
+
+   /**
+    * ...
+    */
+   virtual ui::ResourceFactory *getResourceFactory () = 0;
+};
+
+} // namespace core
+} // namespace dw
+
+#endif // __DW_PLATFORM_HH__