SkCanvasWidget.h revision 7dcae67cae277549accdd38d0496b72d00151239 
1
2/*
3 * Copyright 2012 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9
10#ifndef SKCANVASWIDGET_H
11#define SKCANVASWIDGET_H
12
13#include "SkBitmap.h"
14#include "SkCanvas.h"
15#include "SkDebugCanvas.h"
16#include "SkDevice.h"
17#include "SkPicture.h"
18#include <QApplication>
19#include <QtGui>
20#include <QWidget>
21#include <QWheelEvent>
22
23/** \class SkCanvasWidget
24
25      The QtWidget encompasses all skia screen drawing elements. It initializes
26      an SkBitmap in memory that our SkCanvas draws to directly in memory.
27      Then using QImage and QPainter we draw those pixels on the screen in
28      this widget.
29 */
30class SkCanvasWidget : public QWidget {
31    Q_OBJECT
32
33public:
34    /**
35         Constructs a widget with the specified parent for layout purposes.
36        @param parent  The parent container of this widget
37     */
38    SkCanvasWidget(QWidget *parent);
39
40    ~SkCanvasWidget();
41
42    /**
43        Executes all saved draw commands up to the specified index.
44         @param index  The position of the command we draw up to.
45     */
46    void drawTo(int index);
47
48    /**
49        Returns the height of the bitmap.
50     */
51    int getBitmapHeight() { return fBitmap.height(); }
52
53
54    /*
55        Returns the width of the bitmap.
56     */
57    int getBitmapWidth() { return fBitmap.width(); }
58
59    /**
60        Returns an array of values of the current matrix.
61     */
62    const SkMatrix& getCurrentMatrix() {
63        return fCanvas->getTotalMatrix();
64    }
65
66    /**
67        Returns an array of values of the current bounding clip.
68     */
69    const SkIRect& getCurrentClip() {
70        return fCanvas->getTotalClip().getBounds();
71    }
72
73    /**
74        TODO(chudy): Refactor into a struct of char**
75        Returns parameter information about the ith draw command.
76        @param: i  The index of the draw command we are accessing
77     */
78    std::vector<std::string>* getCurrentCommandInfo(int i) {
79        return fDebugCanvas->getCommandInfoAt(i);
80    }
81
82    /**
83          Returns a vector of strings with all the current canvas draw
84          commands.
85     */
86    std::vector<std::string>* getDrawCommands() {
87        return fDebugCanvas->getDrawCommandsAsStrings();
88    }
89
90    /**
91        Loads a skia picture located at filename.
92        @param filename  The name of the file we are loading.
93     */
94    void loadPicture(QString filename);
95
96    /**
97        Toggles the visibility / execution of the draw command at index i.
98     */
99    void toggleCommand(int index) {
100        fDebugCanvas->toggleCommand(index);
101    }
102
103    /**
104        Toggles the visibility / execution of the draw command at index i with
105        the value of toggle.
106     */
107    void toggleCommand(int index, bool toggle) {
108        fDebugCanvas->toggleCommand(index, toggle);
109    }
110
111    /**
112        Toggles drawing filter on all drawing commands previous to current.
113     */
114    void toggleCurrentCommandFilter(bool toggle) {
115        fDebugCanvas->toggleFilter(toggle);
116    }
117
118    /**
119        Captures mouse clicks
120        @param event  The event intercepted by Qt
121     */
122    void mouseMoveEvent(QMouseEvent* event);
123
124    void mousePressEvent(QMouseEvent* event);
125
126    void mouseDoubleClickEvent(QMouseEvent* event);
127
128    void resizeEvent(QResizeEvent* event);
129
130    void wheelEvent(QWheelEvent* event);
131
132signals:
133    void scaleFactorChanged(float newScaleFactor);
134    void commandChanged(int newCommand);
135
136protected:
137    /**
138        Draws the current state of the widget.
139        @param event  The event intercepted by Qt
140     */
141    void paintEvent(QPaintEvent *event);
142
143private:
144    SkBitmap fBitmap;
145    SkCanvas* fCanvas;
146    SkDebugCanvas* fDebugCanvas;
147    SkDevice* fDevice;
148
149    SkIPoint fPreviousPoint;
150    SkIPoint fTransform;
151
152    int fIndex;
153    float fScaleFactor;
154};
155
156#endif
157