VirtualTouchpad.h revision 89af70bce420f011adfeb0f80984b3895c4d7d9b 
1#ifndef ANDROID_DVR_VIRTUAL_TOUCHPAD_INTERFACE_H
2#define ANDROID_DVR_VIRTUAL_TOUCHPAD_INTERFACE_H
3
4#include <utils/Errors.h>
5#include <utils/RefBase.h>
6#include <utils/StrongPointer.h>
7
8namespace android {
9namespace dvr {
10
11// Provides a virtual touchpad for injecting events into the input system.
12//
13class VirtualTouchpad : public RefBase {
14 public:
15  // Create a virtual touchpad.
16  // Implementations should provide this, and hide their constructors.
17  // For the user, switching implementations should be as simple as changing
18  // the class whose |Create()| is called.
19  static sp<VirtualTouchpad> Create() {
20    return sp<VirtualTouchpad>();
21  }
22
23  // Generate a simulated touch event.
24  //
25  // @param x Horizontal touch position.
26  // @param y Vertical touch position.
27  //            Values must be in the range [0.0, 1.0).
28  // @param pressure Touch pressure.
29  //            Positive values represent contact; use 1.0f if contact
30  //            is binary. Use 0.0f for no contact.
31  // @returns OK on success.
32  //
33  virtual status_t Touch(float x, float y, float pressure) = 0;
34
35  // Generate a simulated touchpad button state.
36  //
37  // @param buttons A union of MotionEvent BUTTON_* values.
38  // @returns OK on success.
39  //
40  // Currently only BUTTON_BACK is supported, as the implementation
41  // restricts itself to operations actually required by VrWindowManager.
42  //
43  virtual status_t ButtonState(int buttons) = 0;
44
45 protected:
46  VirtualTouchpad() {}
47  virtual ~VirtualTouchpad() {}
48
49 private:
50  VirtualTouchpad(const VirtualTouchpad&) = delete;
51  void operator=(const VirtualTouchpad&) = delete;
52};
53
54}  // namespace dvr
55}  // namespace android
56
57#endif  // ANDROID_DVR_VIRTUAL_TOUCHPAD_INTERFACE_H
58