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 <algorithm>
   6
   7 #include "ppapi/cpp/graphics_2d.h"
   8 #include "ppapi/cpp/image_data.h"
   9 #include "ppapi/cpp/input_event.h"
  10 #include "ppapi/cpp/instance.h"
  11 #include "ppapi/cpp/module.h"
  12 #include "ppapi/cpp/mouse_cursor.h"
  13 #include "ppapi/cpp/view.h"
  14
  15 void FillRect(pp::ImageData* image, int left, int top, int width, int height,
  16               uint32_t color) {
  17   for (int y = std::max(0, top);
  18        y < std::min(image->size().height() - 1, top + height);
  19        y++) {
  20     for (int x = std::max(0, left);
  21          x < std::min(image->size().width() - 1, left + width);
  22          x++)
  23       *image->GetAddr32(pp::Point(x, y)) = color;
  24   }
  25 }
  26
  27 class MyInstance : public pp::Instance {
  28  public:
  29   MyInstance(PP_Instance instance)
  30       : pp::Instance(instance), width_(0), height_(0) {
  31     RequestInputEvents(PP_INPUTEVENT_CLASS_MOUSE);
  32   }
  33
  34   virtual ~MyInstance() {
  35   }
  36
  37   virtual void DidChangeView(const pp::View& view) {
  38     width_ = view.GetRect().width();
  39     height_ = view.GetRect().height();
  40   }
  41
  42   virtual bool HandleInputEvent(const pp::InputEvent& event) {
  43     switch (event.GetType()) {
  44       case PP_INPUTEVENT_TYPE_MOUSEDOWN:
  45         return true;
  46       case PP_INPUTEVENT_TYPE_MOUSEMOVE:
  47         HandleMove(pp::MouseInputEvent(event));
  48         return true;
  49       case PP_INPUTEVENT_TYPE_KEYDOWN:
  50         return true;
  51       default:
  52         return false;
  53     }
  54   }
  55
  56   void HandleMove(const pp::MouseInputEvent& event) {
  57     pp::Point point = event.GetPosition();
  58     int segments = 3;
  59     if (point.y() < height_ / segments) {
  60       // Top part gets custom cursor of wait.
  61       pp::MouseCursor::SetCursor(this, PP_MOUSECURSOR_TYPE_WAIT);
  62     } else if (point.y() < (height_ / segments) * 2) {
  63       // Next part gets custom image cursor.
  64       pp::ImageData cursor(this, pp::ImageData::GetNativeImageDataFormat(),
  65                            pp::Size(32, 32), true);
  66       // Note that in real life you will need to handle the case where the
  67       // native format is different.
  68       FillRect(&cursor, 0, 0, 32, 32, 0x80000080);
  69       pp::MouseCursor::SetCursor(this, PP_MOUSECURSOR_TYPE_CUSTOM, cursor,
  70                                  pp::Point(16, 16));
  71     } else {
  72       // Next part gets no cursor.
  73       pp::MouseCursor::SetCursor(this, PP_MOUSECURSOR_TYPE_NONE);
  74     }
  75   }
  76
  77
  78  private:
  79   int width_;
  80   int height_;
  81 };
  82
  83 class MyModule : public pp::Module {
  84  public:
  85   MyModule() : pp::Module() {}
  86   virtual ~MyModule() {}
  87
  88   virtual pp::Instance* CreateInstance(PP_Instance instance) {
  89     return new MyInstance(instance);
  90   }
  91 };
  92
  93 namespace pp {
  94
  95 // Factory function for your specialization of the Module object.
  96 Module* CreateModule() {
  97   return new MyModule();
  98 }
  99
 100 }  // namespace pp