彻底改版2.0

third/qwtdemo/examples/radio/mainwindow.cpp

@@ -0,0 +1,50 @@
+#include <qlayout.h>
+#include "tunerfrm.h"
+#include "ampfrm.h"
+#include "mainwindow.h"
+
+MainWindow::MainWindow():
+    QWidget()
+{
+    TunerFrame *frmTuner = new TunerFrame( this );
+    frmTuner->setFrameStyle( QFrame::Panel | QFrame::Raised );
+
+    AmpFrame *frmAmp = new AmpFrame( this );
+    frmAmp->setFrameStyle( QFrame::Panel | QFrame::Raised );
+
+    QVBoxLayout *layout = new QVBoxLayout( this );
+    layout->setMargin( 0 );
+    layout->setSpacing( 0 );
+    layout->addWidget( frmTuner );
+    layout->addWidget( frmAmp );
+
+    connect( frmTuner, SIGNAL( fieldChanged( double ) ),
+        frmAmp, SLOT( setMaster( double ) ) );
+
+    frmTuner->setFreq( 90.0 );
+
+    setPalette( QPalette( QColor( 192, 192, 192 ) ) );
+    updateGradient();
+}
+
+void MainWindow::resizeEvent( QResizeEvent * )
+{
+    // Qt 4.7.1: QGradient::StretchToDeviceMode is buggy on X11
+    updateGradient();
+}
+
+void MainWindow::updateGradient()
+{
+    QPalette pal = palette();
+
+    const QColor buttonColor = pal.color( QPalette::Button );
+    const QColor midLightColor = pal.color( QPalette::Midlight );
+
+    QLinearGradient gradient( rect().topLeft(), rect().topRight() );
+    gradient.setColorAt( 0.0, midLightColor );
+    gradient.setColorAt( 0.7, buttonColor );
+    gradient.setColorAt( 1.0, buttonColor );
+
+    pal.setBrush( QPalette::Window, gradient );
+    setPalette( pal );
+}