Qt编写导航按钮

liudianwu

做各种各样的界面的时候，经常需要做一排按钮用于切换到对应界面，俗称导航按钮或者导航菜单，参照过各种各样的主界面导航布局，特意编写导航按钮自定义控件，结合各种情况，继承自QPushButton。已集成在QUC自定义控件中。

1. /**
   
2. * 导航按钮控件 作者:feiyangqingyun(QQ:517216493) 2017-12-19
   
3. * 1:可设置文字的左侧+右侧+顶部+底部间隔
   
4. * 2:可设置文字对齐方式
   
5. * 3:可设置显示倒三角/倒三角边长/倒三角位置/倒三角颜色
   
6. * 4:可设置显示图标/图标间隔/图标尺寸/正常状态图标/悬停状态图标/选中状态图标
   
7. * 5:可设置显示边框线条/线条宽度/线条间隔/线条位置/线条颜色
   
8. * 6:可设置正常背景颜色/悬停背景颜色/选中背景颜色
   
9. * 7:可设置正常文字颜色/悬停文字颜色/选中文字颜色
   
10. * 8:可设置背景颜色为画刷颜色
    
11. */

复制代码

本人有代码洁癖症，写代码处处讲究对称完美。如下图所示。


主要代码如下：

1. void NavButton::paintEvent(QPaintEvent *)
   
2. {
   
3.     //绘制准备工作,启用反锯齿
   
4.     QPainter painter(this);
   
5.     painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);
   
6. 
   
7.     //绘制背景
   
8.     drawBg(&painter);
   
9.     //绘制文字
   
10.     drawText(&painter);
    
11.     //绘制图标
    
12.     drawIcon(&painter);
    
13.     //绘制边框线条
    
14.     drawLine(&painter);
    
15.     //绘制右侧倒三角
    
16.     drawTriangle(&painter);
    
17. }
    
18. 
    
19. void NavButton::drawBg(QPainter *painter)
    
20. {
    
21.     painter->save();
    
22.     painter->setPen(Qt::NoPen);
    
23. 
    
24.     int width = this->width();
    
25.     int height = this->height();
    
26. 
    
27.     QRect bgRect;
    
28.     if (linePosition == LinePosition_Left) {
    
29.         bgRect = QRect(lineSpace, 0, width - lineSpace, height);
    
30.     } else if (linePosition == LinePosition_Right) {
    
31.         bgRect = QRect(0, 0, width - lineSpace, height);
    
32.     } else if (linePosition == LinePosition_Top) {
    
33.         bgRect = QRect(0, lineSpace, width, height - lineSpace);
    
34.     } else if (linePosition == LinePosition_Bottom) {
    
35.         bgRect = QRect(0, 0, width, height - lineSpace);
    
36.     }
    
37. 
    
38.     //如果画刷存在则取画刷
    
39.     QBrush bgBrush;
    
40.     if (isChecked()) {
    
41.         bgBrush = checkBgBrush;
    
42.     } else if (hover) {
    
43.         bgBrush = hoverBgBrush;
    
44.     } else {
    
45.         bgBrush = normalBgBrush;
    
46.     }
    
47. 
    
48.     if (bgBrush != Qt::NoBrush) {
    
49.         painter->setBrush(bgBrush);
    
50.     } else {
    
51.         //根据当前状态选择对应颜色
    
52.         QColor bgColor;
    
53.         if (isChecked()) {
    
54.             bgColor = checkBgColor;
    
55.         } else if (hover) {
    
56.             bgColor = hoverBgColor;
    
57.         } else {
    
58.             bgColor = normalBgColor;
    
59.         }
    
60. 
    
61.         painter->setBrush(bgColor);
    
62.     }
    
63. 
    
64.     painter->drawRect(bgRect);
    
65. 
    
66.     painter->restore();
    
67. }
    
68. 
    
69. void NavButton::drawText(QPainter *painter)
    
70. {
    
71.     painter->save();
    
72.     painter->setBrush(Qt::NoBrush);
    
73. 
    
74.     //根据当前状态选择对应颜色
    
75.     QColor textColor;
    
76.     if (isChecked()) {
    
77.         textColor = checkTextColor;
    
78.     } else if (hover) {
    
79.         textColor = hoverTextColor;
    
80.     } else {
    
81.         textColor = normalTextColor;
    
82.     }
    
83. 
    
84.     QRect textRect = QRect(paddingLeft, paddingTop, width() - paddingLeft - paddingRight, height() - paddingTop - paddingBottom);
    
85.     painter->setPen(textColor);
    
86.     painter->drawText(textRect, textAlign | Qt::AlignVCenter, text());
    
87. 
    
88.     painter->restore();
    
89. }
    
90. 
    
91. void NavButton::drawIcon(QPainter *painter)
    
92. {
    
93.     if (!showIcon) {
    
94.         return;
    
95.     }
    
96. 
    
97.     painter->save();
    
98. 
    
99.     QPixmap pix;
    
100.     if (isChecked()) {
     
101.         pix = iconCheck;
     
102.     } else if (hover) {
     
103.         pix = iconHover;
     
104.     } else {
     
105.         pix = iconNormal;
     
106.     }
     
107. 
     
108.     if (!pix.isNull()) {
     
109.         //等比例平滑缩放图标
     
110.         pix = pix.scaled(iconSize, Qt::KeepAspectRatio, Qt::SmoothTransformation);
     
111.         painter->drawPixmap(iconSpace, (height() - iconSize.height()) / 2, pix);
     
112.     }
     
113. 
     
114.     painter->restore();
     
115. }
     
116. 
     
117. void NavButton::drawLine(QPainter *painter)
     
118. {
     
119.     if (!showLine) {
     
120.         return;
     
121.     }
     
122. 
     
123.     if (!isChecked()) {
     
124.         return;
     
125.     }
     
126. 
     
127.     painter->save();
     
128. 
     
129.     QPen pen;
     
130.     pen.setWidth(lineWidth);
     
131.     pen.setColor(lineColor);
     
132.     painter->setPen(pen);
     
133. 
     
134.     //根据线条位置设置线条坐标
     
135.     QPoint pointStart, pointEnd;
     
136.     if (linePosition == LinePosition_Left) {
     
137.         pointStart = QPoint(0, 0);
     
138.         pointEnd = QPoint(0, height());
     
139.     } else if (linePosition == LinePosition_Right) {
     
140.         pointStart = QPoint(width(), 0);
     
141.         pointEnd = QPoint(width(), height());
     
142.     } else if (linePosition == LinePosition_Top) {
     
143.         pointStart = QPoint(0, 0);
     
144.         pointEnd = QPoint(width(), 0);
     
145.     } else if (linePosition == LinePosition_Bottom) {
     
146.         pointStart = QPoint(0, height());
     
147.         pointEnd = QPoint(width(), height());
     
148.     }
     
149. 
     
150.     painter->drawLine(pointStart, pointEnd);
     
151. 
     
152.     painter->restore();
     
153. }
     
154. 
     
155. void NavButton::drawTriangle(QPainter *painter)
     
156. {
     
157.     if (!showTriangle) {
     
158.         return;
     
159.     }
     
160. 
     
161.     //选中或者悬停显示
     
162.     if (!hover && !isChecked()) {
     
163.         return;
     
164.     }
     
165. 
     
166.     painter->save();
     
167.     painter->setPen(Qt::NoPen);
     
168.     painter->setBrush(triangleColor);
     
169. 
     
170.     //绘制在右侧中间,根据设定的倒三角的边长设定三个点位置
     
171.     int width = this->width();
     
172.     int height = this->height();
     
173.     int midWidth = width / 2;
     
174.     int midHeight = height / 2;
     
175. 
     
176.     QPolygon pts;
     
177.     if (trianglePosition == TrianglePosition_Left) {
     
178.         pts.setPoints(3, triangleLen, midHeight, 0, midHeight - triangleLen, 0, midHeight + triangleLen);
     
179.     } else if (trianglePosition == TrianglePosition_Right) {
     
180.         pts.setPoints(3, width - triangleLen, midHeight, width, midHeight - triangleLen, width, midHeight + triangleLen);
     
181.     } else if (trianglePosition == TrianglePosition_Top) {
     
182.         pts.setPoints(3, midWidth, triangleLen, midWidth - triangleLen, 0, midWidth + triangleLen, 0);
     
183.     } else if (trianglePosition == TrianglePosition_Bottom) {
     
184.         pts.setPoints(3, midWidth, height - triangleLen, midWidth - triangleLen, height, midWidth + triangleLen, height);
     
185.     }
     
186. 
     
187.     painter->drawPolygon(pts);
     
188. 
     
189.     painter->restore();
     
190. }

复制代码