ppapi/examples/mouse_cursor/mouse_cursor.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ppapi/cpp/graphics_2d.h"
   6 #include "ppapi/cpp/image_data.h"
   7 #include "ppapi/cpp/input_event.h"
   8 #include "ppapi/cpp/instance.h"
   9 #include "ppapi/cpp/module.h"
  10 #include "ppapi/cpp/mouse_cursor.h"
  11 #include "ppapi/cpp/view.h"
  12
  13 void FillRect(pp::ImageData* image, int left, int top, int width, int height,
  14               uint32_t color) {
  15   for (int y = std::max(0, top);
  16        y < std::min(image->size().height() - 1, top + height);
  17        y++) {
  18     for (int x = std::max(0, left);
  19          x < std::min(image->size().width() - 1, left + width);
  20          x++)
  21       *image->GetAddr32(pp::Point(x, y)) = color;
  22   }
  23 }
  24
  25 class MyInstance : public pp::Instance {
  26  public:
  27   MyInstance(PP_Instance instance)
  28       : pp::Instance(instance), width_(0), height_(0) {
  29     RequestInputEvents(PP_INPUTEVENT_CLASS_MOUSE);
  30   }
  31
  32   virtual ~MyInstance() {
  33   }
  34
  35   virtual void DidChangeView(const pp::View& view) {
  36     width_ = view.GetRect().width();
  37     height_ = view.GetRect().height();
  38   }
  39
  40   virtual bool HandleInputEvent(const pp::InputEvent& event) {
  41     switch (event.GetType()) {
  42       case PP_INPUTEVENT_TYPE_MOUSEDOWN:
  43         return true;
  44       case PP_INPUTEVENT_TYPE_MOUSEMOVE:
  45         HandleMove(pp::MouseInputEvent(event));
  46         return true;
  47       case PP_INPUTEVENT_TYPE_KEYDOWN:
  48         return true;
  49       default:
  50         return false;
  51     }
  52   }
  53
  54   void HandleMove(const pp::MouseInputEvent& event) {
  55     pp::Point point = event.GetPosition();
  56     int segments = 3;
  57     if (point.y() < height_ / segments) {
  58       // Top part gets custom cursor of wait.
  59       pp::MouseCursor::SetCursor(this, PP_MOUSECURSOR_TYPE_WAIT);
  60     } else if (point.y() < (height_ / segments) * 2) {
  61       // Next part gets custom image cursor.
  62       pp::ImageData cursor(this, pp::ImageData::GetNativeImageDataFormat(),
  63                            pp::Size(32, 32), true);
  64       // Note that in real life you will need to handle the case where the
  65       // native format is different.
  66       FillRect(&cursor, 0, 0, 32, 32, 0x80000080);
  67       pp::MouseCursor::SetCursor(this, PP_MOUSECURSOR_TYPE_CUSTOM, cursor,
  68                                  pp::Point(16, 16));
  69     } else {
  70       // Next part gets no cursor.
  71       pp::MouseCursor::SetCursor(this, PP_MOUSECURSOR_TYPE_NONE);
  72     }
  73   }
  74
  75
  76  private:
  77   int width_;
  78   int height_;
  79 };
  80
  81 class MyModule : public pp::Module {
  82  public:
  83   MyModule() : pp::Module() {}
  84   virtual ~MyModule() {}
  85
  86   virtual pp::Instance* CreateInstance(PP_Instance instance) {
  87     return new MyInstance(instance);
  88   }
  89 };
  90
  91 namespace pp {
  92
  93 // Factory function for your specialization of the Module object.
  94 Module* CreateModule() {
  95   return new MyModule();
  96 }
  97
  98 }  // namespace pp