??xml version="1.0" encoding="utf-8" standalone="yes"?>久久播电影网,日本久久久久久中文字幕,久久99精品国产99久久6http://www.shnenglu.com/biao/category/10673.html zh-cnMon, 14 Sep 2009 00:13:08 GMTMon, 14 Sep 2009 00:13:08 GMT60Qt自定义Widget: 用QT创徏新风?/title><link>http://www.shnenglu.com/biao/archive/2009/09/14/96081.html</link><dc:creator>暗金装备</dc:creator><author>暗金装备</author><pubDate>Sun, 13 Sep 2009 23:00:00 GMT</pubDate><guid>http://www.shnenglu.com/biao/archive/2009/09/14/96081.html</guid><wfw:comment>http://www.shnenglu.com/biao/comments/96081.html</wfw:comment><comments>http://www.shnenglu.com/biao/archive/2009/09/14/96081.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.shnenglu.com/biao/comments/commentRss/96081.html</wfw:commentRss><trackback:ping>http://www.shnenglu.com/biao/services/trackbacks/96081.html</trackback:ping><description><![CDATA[<span style="color: rgb(51, 51, 51); font-family: Tahoma, Arial, Helvetica, snas-serif; font-size: 14px; line-height: 25px; "><strong style="word-break: break-all; line-height: normal; ">1QQt的风?/strong><br style="word-break: break-all; line-height: normal; ">  a) Qt?br style="word-break: break-all; line-height: normal; ">  Qt是一个跨q_的C++囑Ş用户界面应用E序开发库Q用Qt可以开发出高质量的囑Ş用户接口Q它是完全面向对象的、易于扩展且允许真正的组件编E。Qt获得了很大的成功Q特别是它的信号-槽机制是非常值得研究的通信机制Q它也是Linux发行版标准组件KDE(K Desktop Enviroment)的基?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  b) 风格机制<br style="word-break: break-all; line-height: normal; ">  Qt的风格机制实C不同q_上的囑Ş用户接口QGUIQ的观感Qlook and feelQ?例如Windowsq_上通常使用Windows或Windows-xp风格Q而Unixq_上通常使用Motif、CDE风格?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  下图昄了Qt中与风格相关的类的承关p?br style="word-break: break-all; line-height: normal; ">   <img src="http://www.chinaitpower.com/A-A-A/2005/05/26/200505261452007056.gif" onclick="javascript:window.open(this.src);" onload="return imgzoom(this,550)" title="点击囄可在新窗口打开" style="word-break: break-all; line-height: normal; max-width: 500px; cursor: pointer; "><br style="word-break: break-all; line-height: normal; ">  QStyle是所有风格类的基c,它控制着所有的部gQwidget即windows~程中的控gQ的界面风格或观感,它定义了大量的枚丄型和十几个函数。枚丄型表C界面上的不同元素(如组合框中的按钮Q按钮的Ҏ{)Q函数控制图形用L面的l制Q但大多数函数基本上只是一些声明而没有函数实玎ͼ他们的实现在QCommonStyle、QWindowStyle、QMotifStyle及其子类中。QStyle只实C3个函数drawItem()," itemRect(), visualRect()?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  drawItem(): 负责l制文本和象素图?br style="word-break: break-all; line-height: normal; ">  itemRect(): q回文本或图像所占的区域?br style="word-break: break-all; line-height: normal; ">  visualRect(): q回逻辑坐标Q这个函CQt实现right-to-left风格Q阿文、维文传l是文本从右向左昄Q因此控件布局也是从右向左Q。如下图所C:<br style="word-break: break-all; line-height: normal; ">   <img src="http://www.chinaitpower.com/A-A-A/2005/05/26/200505261452005334.gif" onclick="javascript:window.open(this.src);" onload="return imgzoom(this,550)" title="点击囄可在新窗口打开" style="word-break: break-all; line-height: normal; max-width: 500px; cursor: pointer; "><br style="word-break: break-all; line-height: normal; ">  可以看到菜单、工h是右寚w、单选框的按钮在双<br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  c)" 创徏新风格的步骤<br style="word-break: break-all; line-height: normal; ">  在Qt中实CU新风格的步骤很单:只需选择一个风格类Q如QCommonStyle或QStyleQ作为父c,然后实现感兴的函数卛_。难点在于函数的实现?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  选择父类Q可以选择QStyle, QCommonStyle, QWindowStyle, QMotifStyle以及他们的子cȝL一个作为父cR通常可以选择QWindowsStyle或QMotifStyleQ也可以选择QCommonStyle甚至是QStyleQ但是工作量会比较大Q因为很多界面的l节需要自己实现?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  重新实现必要的函敎ͼ想修改界面风格的哪部分,重新实Cl制那部分相关的函数Q下面解释一下我们要重蝲的QStyle中的几个函数Q这几个函数控制着囑Ş用户界面上不同元素的布局和观感?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">             1Qvoid drawPrimitive( PrimitiveElement pe,<br style="word-break: break-all; line-height: normal; ">             QPainter *p,<br style="word-break: break-all; line-height: normal; ">              const QRect & r,<br style="word-break: break-all; line-height: normal; ">              const QColorGroup & cg,<br style="word-break: break-all; line-height: normal; ">              SFlags flags = Style_Default,<br style="word-break: break-all; line-height: normal; ">              const QStyleOption &opt = QStyleOption::Default ) ;<br style="word-break: break-all; line-height: normal; ">              <br style="word-break: break-all; line-height: normal; ">  功能Q绘制基本图形元素,如QSpinBox中的带箭头的按钮 <img src="http://www.chinaitpower.com/A-A-A/2005/05/26/200505261452005795.gif" onclick="javascript:window.open(this.src);" onload="return imgzoom(this,550)" title="点击囄可在新窗口打开" style="word-break: break-all; line-height: normal; max-width: 500px; cursor: pointer; ">{?br style="word-break: break-all; line-height: normal; ">  参数Q? PrimitiveElement pe: q个枚D型变量表C将要绘制的基本囑Ş界面元素Q这里说的基本图形用L面元素指GUI中不可再分的一个原子元素,如组合框 <img src="http://www.chinaitpower.com/A-A-A/2005/05/26/200505261452002895.gif" onclick="javascript:window.open(this.src);" onload="return imgzoom(this,550)" title="点击囄可在新窗口打开" style="word-break: break-all; line-height: normal; max-width: 500px; cursor: pointer; ">中的q个l有黑色三角形的按钮QspinBox中的按钮 <img src="http://www.chinaitpower.com/A-A-A/2005/05/26/200505261452003019.gif%22" onclick="javascript:window.open(this.src);" onload="return imgzoom(this,550)" title="点击囄可在新窗口打开" style="word-break: break-all; line-height: normal; max-width: 500px; cursor: pointer; "><br style="word-break: break-all; line-height: normal; ">  QPainter *pQ指向QPaintercȝ指针QQt中的所有绘制操作不是l制文本、图形还是图像都p个类来处理?br style="word-break: break-all; line-height: normal; ">  QRect &r: 表示一个矩形区域,Qt在这个区域中l制基本界面元素QPrimitiveElementQ?<br style="word-break: break-all; line-height: normal; ">  QColorGroup &cg: QColorGroup表示一个部?widget)的颜色组Qcolor groupQ,color group含有部gl制自己时用的各种颜色Q譬如前景色背景色等。下囑ֱCZcolor group中的各种颜色属?br style="word-break: break-all; line-height: normal; ">   <img src="http://www.chinaitpower.com/A-A-A/2005/05/26/200505261452007748.gif" onclick="javascript:window.open(this.src);" onload="return imgzoom(this,550)" title="点击囄可在新窗口打开" style="word-break: break-all; line-height: normal; max-width: 500px; cursor: pointer; "><br style="word-break: break-all; line-height: normal; ">  SFlags" flags: 控制如何l制囑Ş界面元素的标志?br style="word-break: break-all; line-height: normal; ">  QStyleOption &opt: l制不同的部?widget)时会需要不同的参数Q如l制面板QpanelQ可能需要线宽作为额外参数而绘制焦点矩形(focus rectQ可能需要背景色作ؓ额外参数Q所以Qt专门提供了一个类QStyleOption来封装不同的widget可能需要的不同的参敎ͼopt指向q样一个类的对象?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  2Qvoid drawComplexControl( ComplexControl control,<br style="word-break: break-all; line-height: normal; ">  QPainter *p,<br style="word-break: break-all; line-height: normal; ">  const QWidget *widget,<br style="word-break: break-all; line-height: normal; ">  const QRect &r,<br style="word-break: break-all; line-height: normal; ">  const QColorGroup &cg,<br style="word-break: break-all; line-height: normal; ">  SFlags flags = Style_Default,<br style="word-break: break-all; line-height: normal; ">  SCFlags controls = QStyle::SC_All,<br style="word-break: break-all; line-height: normal; ">  SCFlags active = QStyle::SC_None,<br style="word-break: break-all; line-height: normal; ">  const QStyleOption& opt = QStyleOption::Default)<br style="word-break: break-all; line-height: normal; ">      <br style="word-break: break-all; line-height: normal; ">  功能Q绘制复杂控刉ӞwidgetQ如SpinWidgetQcomboBoxQsliderQlistView{?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  参数Q?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  ComplexControl controlQ是一个枚NQ表C将要绘制的复杂控制部gQwidgetQ如l合框、列表框{?br style="word-break: break-all; line-height: normal; ">  QPainter *pQ指向QPainter的指针,Qt中的所有绘制操作不是l制文本、图形还是图像都p个类来处理?br style="word-break: break-all; line-height: normal; ">  QWidget *widgetQ指向QWdget或其子类的指针,可以Ҏ上面control的D{变(castQ成合适的cdQ例如如果要l制QSpinWidgetQ那么control取gؓCC_SpinWidget,而widget指向一个QSpinWidget(QWidget的子c?的实例(instanceQ。用这个变量可以访问QSpinWidget的成员函数和成员变量Q譬如可以调用QSpinWidget的sizeHint函数获得q个部g的缺省大(一个矩形空_?br style="word-break: break-all; line-height: normal; ">  QRect &r: 表示一个矩形区域,Qt在这个区域中l制控g或其子部件?br style="word-break: break-all; line-height: normal; ">  QColorGroup &cg: QColorGroup表示一个部?widget)的颜色组Qcolor groupQ,color group含有部gl制自己时用的各种颜色Q譬如前景色背景色等?br style="word-break: break-all; line-height: normal; ">  SFlags flags: 控制如何l制囑Ş界面元素的标?br style="word-break: break-all; line-height: normal; ">  SCFlags controls表示l制复杂控制部gcontrol的哪个子部gQ缺省ؓSC_All,即绘制整个control而不是其某个子部Ӟ注意control, controls是两个不同的参数Q?br style="word-break: break-all; line-height: normal; ">  QStyleOption &opt: 在绘制不同的部g时可能需要不同的额外的参敎ͼq个变量在绘制不同的widget时提供不同的信息?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  3) QRect querySubControlMetrics(ComplexControl control,<br style="word-break: break-all; line-height: normal; ">    const QWidget* widget,<br style="word-break: break-all; line-height: normal; ">  SubControl sc,<br style="word-break: break-all; line-height: normal; ">  const QStyleOption& = QStyleOption::Default)<br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  功能Q获取子部g的坐标和寸信息。这个函数控制着一个复杂控件的布局Q重载这个函数可以的组合框的下拉按钮绘制在左边 而不是默认的双?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  参数Q?br style="word-break: break-all; line-height: normal; ">  ComplexControl control: 枚D量,表示要l制的复杂控刉ӞwidgetQ如l合框、列表框{?br style="word-break: break-all; line-height: normal; ">  QWidget *widgetQ指向QWidget或其子类的指针,可以Ҏ上面control的D{变(castQ成合适的cdQ例如如果要l制QSpinWidgetQ那么control取gؓCC_SpinWidget,而widget指向一个QSpinWidget(QWidget的子c?的实例。用这个变量可以访问QSpinWidget的成员函数和成员变量Q譬如可以调用QSpinWidget的sizeHint函数获得q个部g的缺省大(一个矩形空_?br style="word-break: break-all; line-height: normal; ">  SubControl scQ枚NQ一个复杂部件可能由多个的子部gl成Q用sc变量说明要获取那个子部g的坐标和寸信息?br style="word-break: break-all; line-height: normal; ">  QStyleOption &opt: 计算不同部g的尺寸时可能需要不同的额外信息,QStyleOption装了这些信息?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  <strong style="word-break: break-all; line-height: normal; ">2Q创建新风格</strong><br style="word-break: break-all; line-height: normal; ">  下面用一个例子来介绍一下创建新风格的整个过E,在编E之前,先看一下最l的l果是什么样的?在Qt内部QSpinBoxcL通过QSpinWidget实现?<br style="word-break: break-all; line-height: normal; ">  默认风格的效果: <img src="http://www.chinaitpower.com/A-A-A/2005/05/26/20050526145200140.gif" onclick="javascript:window.open(this.src);" onload="return imgzoom(this,550)" title="点击囄可在新窗口打开" style="word-break: break-all; line-height: normal; max-width: 500px; cursor: pointer; ">使用新风格的效果Q <img src="http://www.chinaitpower.com/A-A-A/2005/05/26/200505261452007607.gif%22" onclick="javascript:window.open(this.src);" onload="return imgzoom(this,550)" title="点击囄可在新窗口打开" style="word-break: break-all; line-height: normal; max-width: 500px; cursor: pointer; "><br style="word-break: break-all; line-height: normal; ">  可以看到在新风格中我们的SpinBox有了垂直昄的效果。下面我们按上面说明的步骤来创徏一U新的风根{?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  1Q选择基类Q我们选择QWindowsStylecM为我们新风格cȝ基类Q当然也可以选择QMotifStyleQ在q个例子U也可以选择QCommonStyle。一般不选择QCommonStyle作ؓ基类Q因为QCommonStyle只实C一部分界面部gQ如果要实现一个完整的风格c,我们需要重新写很多代码?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  2Q重载相关的函数Q在q个例程中我们只修改了spinBox的风|实现q个部gQwidgetQ只与QStylecȝ三个函数drawPrimitive, drawComplexControl, qureySubControlMerics相关Q所以我们只需重蝲q三个函数的相关部分代码.下面对代码中的关键部分做一下注释,不重要的部分省略了。详l的代码可以从后面下载?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  l制spinbox中按钮的函数Q?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  void CustomStyle::drawPrimitive( PrimitiveElement pe,<br style="word-break: break-all; line-height: normal; ">              QPainter * p,<br style="word-break: break-all; line-height: normal; ">                const QRect & r,<br style="word-break: break-all; line-height: normal; ">                const QColorGroup & cg,<br style="word-break: break-all; line-height: normal; ">                SFlags flags,<br style="word-break: break-all; line-height: normal; ">                const QStyleOption & opt ) const<br style="word-break: break-all; line-height: normal; ">  {<br style="word-break: break-all; line-height: normal; ">  /*PE_SpinWidgetUp,PE_SpinWidgetDown表示spinBox中的下按钮和上按钮,下面的代码得这两个按钮中的三角形分别向左和向右*/<br style="word-break: break-all; line-height: normal; ">  if ((pe == PE_SpinWidgetUp) || (pe == PE_SpinWidgetDown)){<br style="word-break: break-all; line-height: normal; ">  int fw = pixelMetric( PM_DefaultFrameWidth, 0 );//fw表示Ҏ宽度Q默认ؓ2<br style="word-break: break-all; line-height: normal; ">  QRect br; //spinBox上按钮的边界矩Ş不是spinBox的边界矩形?br style="word-break: break-all; line-height: normal; ">  br.setRect( r.x() + fw, r.y() + fw, r.width() - fw*2,<br style="word-break: break-all; line-height: normal; ">    r.height() - fw*2 );<br style="word-break: break-all; line-height: normal; ">  p->fillRect( br, cg.brush( QColorGroup::Button ) );<br style="word-break: break-all; line-height: normal; ">  int x = r.x(), y = r.y(), w = r.width(), h = r.height();<br style="word-break: break-all; line-height: normal; ">  int sw = w-4;<br style="word-break: break-all; line-height: normal; ">  int sh = sw/2 + 2;   // Must have empty row at foot of arrow<br style="word-break: break-all; line-height: normal; ">  int sx = x + w / 2 - sw / 2 - 1;<br style="word-break: break-all; line-height: normal; ">  int sy = y + h / 2 - sh / 2 - 1;<br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  QPointArray a;<br style="word-break: break-all; line-height: normal; ">  /* 讄三角形的三个点的坐标Q修改这三个点可以得QSpinBox上按钮里的三角型呈现L的ŞӞ下面的设|得三角Ş表示的箭头分别向左和向右?/<br style="word-break: break-all; line-height: normal; ">  if ( pe == PE_SpinWidgetDown )<br style="word-break: break-all; line-height: normal; ">    a.setPoints( 3, 0, sh/2, sw-1, 1, sw-1, sh-1 );<br style="word-break: break-all; line-height: normal; ">   else<br style="word-break: break-all; line-height: normal; ">    a.setPoints( 3, 0, 1, 0, sh-1, sw-1, sh/2 );<br style="word-break: break-all; line-height: normal; ">  ...........<br style="word-break: break-all; line-height: normal; ">  p->drawPolygon( a );  //l制三角?br style="word-break: break-all; line-height: normal; ">  }else if((pe == PE_ButtonBevel) || (pe == PE_ButtonCommand) || (pe == PE_ButtonTool) || (pe == PE_ButtonDropDown) || (pe == PE_HeaderSection))<br style="word-break: break-all; line-height: normal; ">    { //l制按钮的各U效果得看h凸v或凹下?br style="word-break: break-all; line-height: normal; ">    qDrawShadePanel(p, r, cg, flags & (Style_Sunken | Style_Down | Style_On), <br style="word-break: break-all; line-height: normal; ">  1, &cg.brush(QColorGroup::Button));<br style="word-break: break-all; line-height: normal; ">    }else{ <br style="word-break: break-all; line-height: normal; ">  /*对于其他基本囑Ş元素(PrimitiveElement)的绘制我们不作处理只是简单的调用父类的函数?/<br style="word-break: break-all; line-height: normal; ">  QWindowsStyle::drawPrimitive( pe, p, r, cg, flags, opt);<br style="word-break: break-all; line-height: normal; ">    }<br style="word-break: break-all; line-height: normal; ">  }<br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  l制整个spinBox的函敎ͼ<br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  void CustomStyle::drawComplexControl( ComplexControl control,<br style="word-break: break-all; line-height: normal; ">      QPainter *p,<br style="word-break: break-all; line-height: normal; ">      const QWidget *widget,<br style="word-break: break-all; line-height: normal; ">      const QRect &r,<br style="word-break: break-all; line-height: normal; ">      const QColorGroup &cg,<br style="word-break: break-all; line-height: normal; ">      SFlags flags,<br style="word-break: break-all; line-height: normal; ">      SCFlags controls,<br style="word-break: break-all; line-height: normal; ">      SCFlags active,<br style="word-break: break-all; line-height: normal; ">      const QStyleOption& opt ) const<br style="word-break: break-all; line-height: normal; ">  {  <br style="word-break: break-all; line-height: normal; ">  //下面的代码得spinWidget呈现垂直昄的风D不是通常的水qxC?br style="word-break: break-all; line-height: normal; ">  if (control == CC_SpinWidget) {<br style="word-break: break-all; line-height: normal; ">  const QSpinWidget * sw = (const QSpinWidget *) widget;<br style="word-break: break-all; line-height: normal; ">  //l制向上按钮部分Qcontrols默认为SC_AllQ即l制整个spinwidget<br style="word-break: break-all; line-height: normal; ">  if ( controls & SC_SpinWidgetUp ) {<br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">    if ( sw->buttonSymbols() == QSpinWidget::PlusMinus )<br style="word-break: break-all; line-height: normal; ">  pe = PE_SpinWidgetPlus; // 使用加减受<img src="http://www.chinaitpower.com/A-A-A/2005/05/26/200505261452008145.gif" onclick="javascript:window.open(this.src);" onload="return imgzoom(this,550)" title="点击囄可在新窗口打开" style="word-break: break-all; line-height: normal; max-width: 500px; cursor: pointer; "><br style="word-break: break-all; line-height: normal; ">    else<br style="word-break: break-all; line-height: normal; ">  pe" = PE_SpinWidgetUp;  // 使用三角形 <img src="http://www.chinaitpower.com/A-A-A/2005/05/26/200505261452007091.gif" onclick="javascript:window.open(this.src);" onload="return imgzoom(this,550)" title="点击囄可在新窗口打开" style="word-break: break-all; line-height: normal; max-width: 500px; cursor: pointer; "><br style="word-break: break-all; line-height: normal; ">    QRect" re = sw->upRect();<br style="word-break: break-all; line-height: normal; ">    QColorGroup ucg = sw->isUpEnabled() ? cg : sw->palette().disabled();<br style="word-break: break-all; line-height: normal; ">    drawPrimitive(PE_ButtonBevel, p, re, ucg, flags); //l制按钮的边?br style="word-break: break-all; line-height: normal; ">  drawPrimitive(pe, p, re, ucg, flags); //l制按钮<br style="word-break: break-all; line-height: normal; ">  }<br style="word-break: break-all; line-height: normal; ">  //l制向左按钮部分?br style="word-break: break-all; line-height: normal; ">  if ( controls & SC_SpinWidgetDown ) {<br style="word-break: break-all; line-height: normal; ">   /*与绘制向下按钮相?/<br style="word-break: break-all; line-height: normal; ">  }<br style="word-break: break-all; line-height: normal; ">  }else{//不处理spinbox之外的其他复杂控刉Ӟ调用父类函数处理<br style="word-break: break-all; line-height: normal; ">  QWindowsStyle::drawComplexControl(control, p, widget, r, cg, flags, controls, active, opt);<br style="word-break: break-all; line-height: normal; ">    }<br style="word-break: break-all; line-height: normal; ">  }<br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  获取部gQwidgetQ中各个子部件布局信息的函敎ͼq个函数控制着一个widget的外?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  QRect CustomStyle::querySubControlMetrics( ComplexControl control,<br style="word-break: break-all; line-height: normal; ">    const QWidget *widget,<br style="word-break: break-all; line-height: normal; ">    SubControl sc,<br style="word-break: break-all; line-height: normal; ">    const QStyleOption &opt ) const<br style="word-break: break-all; line-height: normal; ">  {<br style="word-break: break-all; line-height: normal; ">    if(control == CC_SpinWidget){<br style="word-break: break-all; line-height: normal; ">    int fw = pixelMetric( PM_SpinBoxFrameWidth, widget);<br style="word-break: break-all; line-height: normal; ">  /*QSize 定义二维对象的大?也就是宽和高. 坐标cd是QCOORD定义为int)*/<br style="word-break: break-all; line-height: normal; ">  QSize bs; //此处bs表示每个按钮的大?因ؓ有两个按钮所以下面除?.<br style="word-break: break-all; line-height: normal; ">  bs.setWidth(widget->width()/2 -fw);<br style="word-break: break-all; line-height: normal; ">  if(bs.width() < 8) bs.setWidth(8);<br style="word-break: break-all; line-height: normal; ">  /*按钮高度讄为QMIN{按钮宽度?.6? 部g高度的四分之一}<br style="word-break: break-all; line-height: normal; ">  bs.setHeight( QMIN(bs.width()*8/5, widget->height() / 4) ); <br style="word-break: break-all; line-height: normal; ">  bs = bs.expandedTo( QApplication::globalStrut() );<br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  int x = fw;<br style="word-break: break-all; line-height: normal; ">  int y, ly, ry;<br style="word-break: break-all; line-height: normal; ">  y = widget->height() - x - bs.height();<br style="word-break: break-all; line-height: normal; ">  ly = fw;<br style="word-break: break-all; line-height: normal; ">  ry = y - fw;<br style="word-break: break-all; line-height: normal; ">  //下面定义了QSpinWidget的各个子部g的坐标位|?<br style="word-break: break-all; line-height: normal; ">  switch ( sc ) {<br style="word-break: break-all; line-height: normal; ">  case SC_SpinWidgetUp:<br style="word-break: break-all; line-height: normal; ">  //q回向右按钮的坐标信?br style="word-break: break-all; line-height: normal; ">    return QRect(x + bs.width(), y, bs.width(), bs.height());<br style="word-break: break-all; line-height: normal; ">  case SC_SpinWidgetDown:<br style="word-break: break-all; line-height: normal; ">  //q回向左按钮的坐标信?br style="word-break: break-all; line-height: normal; ">    return QRect(x, y, bs.width(), bs.height());<br style="word-break: break-all; line-height: normal; ">  case SC_SpinWidgetButtonField:<br style="word-break: break-all; line-height: normal; ">  //q回两个按钮的d域大?br style="word-break: break-all; line-height: normal; ">    return QRect(x, y, widget->width() - 2*fw, bs.height());<br style="word-break: break-all; line-height: normal; ">  case SC_SpinWidgetEditField:<br style="word-break: break-all; line-height: normal; ">  /*q回可编辑框的坐标信?/<br style="word-break: break-all; line-height: normal; ">    return QRect(fw, ly, widget->width() - 2*fw, ry);<br style="word-break: break-all; line-height: normal; ">  case SC_SpinWidgetFrame:<br style="word-break: break-all; line-height: normal; ">  //q回整个spinBox的坐标信?br style="word-break: break-all; line-height: normal; ">    return widget->rect();<br style="word-break: break-all; line-height: normal; ">  default:<br style="word-break: break-all; line-height: normal; ">    break;<br style="word-break: break-all; line-height: normal; ">  }<br style="word-break: break-all; line-height: normal; ">    }else{//其它部g的布局信息调用父类的函数来处理?br style="word-break: break-all; line-height: normal; ">  return QWindowsStyle::querySubControlMetrics(control,widget,sc,opt );<br style="word-break: break-all; line-height: normal; ">    }<br style="word-break: break-all; line-height: normal; ">    return QRect();<br style="word-break: break-all; line-height: normal; ">  }<br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  <strong style="word-break: break-all; line-height: normal; ">3Q用新风格</strong><br style="word-break: break-all; line-height: normal; ">  有两U方法用新风格Q一U是作ؓ插gQ一U是在应用程序里直接使用。作为插件的风格可以在不用修改代码、不用重新编译的情况下用新风格。由于本文着重介l如何创建风格所以我们用第一U方法。这U方法很单,只需在应用程序中包含相应风格cȝ头文Ӟ然后把mainQ)函数W一句可执行代码讄为QApplication::setStyle(new MyStyle())卛_?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  下面我们用一个小例子来看看效果?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  #include <qapplication.h style="word-break: break-all; line-height: normal; "><br style="word-break: break-all; line-height: normal; ">  #include <qspinbox.h style="word-break: break-all; line-height: normal; "><br style="word-break: break-all; line-height: normal; ">  #include "customstyle.h"<br style="word-break: break-all; line-height: normal; ">  int main( int argc, char **argv )<br style="word-break: break-all; line-height: normal; ">  {<br style="word-break: break-all; line-height: normal; ">    QApplication::setStyle(new CustomStyle()); //使用新风格类来绘制界面?br style="word-break: break-all; line-height: normal; ">    QApplication a( argc, argv );<br style="word-break: break-all; line-height: normal; ">    QSpinBox spin( 0, 15 );<br style="word-break: break-all; line-height: normal; ">    spin.resize( 20, 100 );<br style="word-break: break-all; line-height: normal; ">    a.setMainWidget( &spin );<br style="word-break: break-all; line-height: normal; ">    spin.show();<br style="word-break: break-all; line-height: normal; ">    return a.exec();<br style="word-break: break-all; line-height: normal; ">  }<br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  然后~译q行卛_看到效果?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  Ps. qt中编译用qmakeQ步骤ؓ<br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  创徏源程?nbsp;<br style="word-break: break-all; line-height: normal; ">  同一目录下运行qmake -project <br style="word-break: break-all; line-height: normal; ">  qmake <br style="word-break: break-all; line-height: normal; ">  make <br style="word-break: break-all; line-height: normal; ">  q行可执行程序?nbsp;<br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  <strong style="word-break: break-all; line-height: normal; ">4Q进一步工?/strong><br style="word-break: break-all; line-height: normal; ">  1Q默认大:l心的朋友可能看C面的代码中有一句:spin.resize( 20, 100 )Q这一句设|spinbox的长度ؓ20象素Q宽度ؓ100个象素。如果没有这一句的话,昄的结果会一团糟Q两个按钮几乎看不到<img src="http://www.chinaitpower.com/A-A-A/2005/05/26/20050526145200453.gif" onclick="javascript:window.open(this.src);" onload="return imgzoom(this,550)" title="点击囄可在新窗口打开" style="word-break: break-all; line-height: normal; max-width: 500px; cursor: pointer; ">Q因为qt默认的显C是水^昄而根本没有考虑垂直昄的情c?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  如果惌spinbox在默认情况下看v来长度窄而宽度高需要修改QSpinBoxcM的sizeHint函数Q这个函数功能是讄部g(widget)的默认尺寸。在qt中几乎每个GUI部gc都有sizeHintq个函数来设|它自己的默认的长和宽?br style="word-break: break-all; line-height: normal; ">  <br style="word-break: break-all; line-height: normal; ">  文本垂直昄Q在此例中虽然控件spinbox辑ֈ了垂直显C的效果Q但是文本仍旧是水^昄的,因此要达到真正的垂直昄需要了解qt的文本显C机制。这些工作是很有意义的,因ؓ有些民族Q如蒙文Q的语言传统是垂直昄的,而现在没有一个真正满U需求的pȝ。笔者现在正在看qt-x11-free-3.2.2的源码,目前Ҏ本显C机制只有初步了解,q没有真正弄清,非常希望和感兴趣的朋友相互交、学习?</qspinbox.h></qapplication.h></span> <div><font color="#333333" face="Tahoma, Arial, Helvetica, snas-serif" size="4"><span style="font-size: 14px;"><br></span></font></div><div><font color="#333333" face="Tahoma, Arial, Helvetica, snas-serif" size="4"><span style="font-size: 14px;">转自: http://www.lupaworld.com/?action-viewstutorial-itemid-7178</span></font></div><img src ="http://www.shnenglu.com/biao/aggbug/96081.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.shnenglu.com/biao/" target="_blank">暗金装备</a> 2009-09-14 07:00 <a href="http://www.shnenglu.com/biao/archive/2009/09/14/96081.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>QtWidget: 利用Qt4.5新特性实现酷炫透明H体http://www.shnenglu.com/biao/archive/2009/06/12/87508.html暗金装备暗金装备Fri, 12 Jun 2009 09:27:00 GMThttp://www.shnenglu.com/biao/archive/2009/06/12/87508.htmlhttp://www.shnenglu.com/biao/comments/87508.htmlhttp://www.shnenglu.com/biao/archive/2009/06/12/87508.html#Feedback5http://www.shnenglu.com/biao/comments/commentRss/87508.htmlhttp://www.shnenglu.com/biao/services/trackbacks/87508.html

Qt4.2引入?span style="color: rgb(0, 0, 128); ">QWidget::setWindowOpacity函数Q?可以为窗体设|透明度, ?.0?.0之间Q?D越透明?l过讄的窗体可以整体呈现透明的效果?但这U设|比较粗p, 只能设一个整体的效果Q?大概只有比如像拖动的时候能用一下, 大多数时候都不太实用?在Qt4.5里引入了新的H体透明Ҏ, 是个Widget的AttributeQ?叫做Qt::WA_TranslucentBackground?q个属性可以ؓ每个QWidget单独讄Q?q且透明E度可以用绘制的颜色或图片的Alpha Channel值来控制?/p>

W者写了一个例子演C其奇妙的效果?先看一个截图:
translucent

q个是笔者例子运行出来的效果Q?背景是www.cuteqt.com雷h的主c?nbsp; 下面单介l一下代码的实现?/p>

TranslucentBackground控制H体透明属?/strong>
例子ȝ面用QWidgetQ?其上攄四个控gQ?上面两个是自定义的QWidget子类Q?用在paintEvent中绘制了一q透明底色的图片, 上书“CuteQt”几个大字Q?下面两个是标准的QLabel控gQ?但显C出两种不同的效果?/p>

透明的控件的TranslucentBackground属性ؓtrue Q承了parent的属性)Q?而非透明的控件则在代码中强制TranslucentBackground设ؓ了falseQ?q样造就了有意思的l果?代码片段如下Q?br>label = new QLabel(”www.cuteqt.com”);
label->setAttribute(Qt::WA_TranslucentBackground, false);
label->setAutoFillBackground(true);

Alpha Channel控制透明?/strong>
这个例子稍E改动, 修改一下窗体背景色的Alpha| 使之展现不同的透明度?实现的方法是讄H体的palette属性, 为Backgroundq个ColorRole的颜色设|了alpha| 代码片段如下Q?br>QPalette pal = palette();
pal.setColor(QPalette::Background, QColor(255,0,0,200));
setPalette(pal);

下图所CZؓalpha?00?00的不同显C效果?/p>

translucent1

translucent2

怎么P q个例子挺有意思吧Q?赶快下蝲完整的代码学习一下吧?有Q何不明白blog或bbs留言?/p>

translucent.tar.gz