WIP: GUI Toolkit

2015-03-09 01:11:13 +01:00
parent ffbc59140a
commit 9d7dd452c7
24 changed files with 1003 additions and 134 deletions
--- a/Widget.hh
+++ b/Widget.hh
@@ -0,0 +1,114 @@
+#ifndef __OPENGLPLAYGROUND_WIDGET_HH__
+#define __OPENGLPLAYGROUND_WIDGET_HH__
+
+#include <memory>
+#include <SDL2/SDL.h>
+#include <glbinding/gl/types.h>
+
+#include "common.hh"
+#include "VBOManager.hh"
+
+/* Size the widget to wrap the content size */
+static const int WRAP_CONTENT = -1;
+
+/* Size the widget to match the parent. If there is no parent, behaves like
+   WRAP_CONTENT */
+static const int MATCH_PARENT = -2;
+
+
+static const int ALIGN_TOP = 0;
+static const int ALIGN_BOTTOM = 1;
+static const int ALIGN_CENTER = 2;
+static const int ALIGN_LEFT = 0;
+static const int ALIGN_RIGHT = 1;
+
+class Texture2D;
+
+class Widget {
+public:
+  Widget(int width = WRAP_CONTENT, int height = WRAP_CONTENT, std::string name = "");
+  
+  Widget(Widget const& copy) = delete;
+  Widget& operator=(Widget const& copy) = delete;
+
+  virtual ~Widget();
+
+  std::string const& getName() const { return name_; }
+
+  Widget* getParent() { return parent_; }
+  
+  int getWidth() const { return width_; }
+  int getHeight() const { return height_; }
+  int getRealWidth() const { return realWidth_; }
+  int getRealHeight() const { return realHeight_; }
+
+  virtual void setSize(int width, int height);
+
+  /* Set background image. The image is scaled to the widgets actual size*/
+  void setBackground(SDL_Surface* surf);
+  /* Set background color. Only takes effect when the background image is NULL */
+  void setBackgroundColor(SDL_Color bg);
+  /* Set foreground color. Effect depends on widget type */
+  virtual void setForegroundColor(SDL_Color fg);
+
+  /* Set the padding between the widget position and the content
+     Exact effect depends on widget type. In general, when a widget is rendered 
+     the background is applied to the entire dstRect, and the content is
+     rendered with padding*/
+  void setPadding(int left, int top, int right, int bottom);
+
+  virtual void setAlignment(int horiz, int vert);
+  
+  void setGLRenderPos(int left, int top);
+  
+  virtual void render(SDL_Surface *dst, SDL_Rect *dstRect) const;
+  void renderToGL() const;
+
+protected:
+  /* Update realWidth_ and realHeight_ where necessary 
+     (width_ or height_ == WRAP_CONTENT) */
+  virtual void layout() = 0;
+
+  /* Inform the renderToGL() code that any cached presentations are now invalid */
+  void invalidateGL() { renderTexValid_ = false; }
+
+  /* Helper to calculate the SDL_Rect with which to render the content,
+     respecting alignment and padding */
+  SDL_Rect calcContentRect(SDL_Surface *dst, SDL_Rect *dstRect, SDL_Rect contentRect) const;
+
+  void setParent(Widget *parent);
+
+  /* Helpers to allow Views to access protected methods of other Widgets */
+  void _setParent(Widget& child) { child.setParent(this); }
+  void _clearParent(Widget& child) { child.setParent(nullptr); }
+  void _layout(Widget& child) { child.layout(); }
+  
+  std::string name_;
+  
+  int width_, height_;
+  int realWidth_, realHeight_;
+
+  SDL_Surface *background_;
+  SDL_Color bg_, fg_;
+
+  int padLeft_, padTop_, padRight_, padBottom_;
+
+  int alignHoriz_, alignVert_;
+
+  Widget *parent_;
+  
+private:
+  struct VertexAttribs {
+    int16_t vertex[2];
+    uint16_t texCoords[2];
+  } __attribute__((__packed__));
+  
+  int renderTop_, renderLeft_;
+  
+  mutable bool renderTexValid_, renderAttribsValid_;
+  mutable std::unique_ptr<Texture2D> renderTex_;
+  mutable VBOManager::VBOAlloc vbo_;
+  mutable gl::GLuint vaID_;
+};
+
+#endif