改变图像显示的rgb波段：

实现界面逻辑，运行有错，没完成

HPPA/imageControl.h

@@ -7,6 +7,8 @@
 
 #include "ui_imgControl.h"
 
+class RasterLayer;
+
 class ImageControl : public QDialog
 {
 	Q_OBJECT
@@ -15,9 +17,32 @@ public:
 	ImageControl(QWidget* parent = nullptr);
 	~ImageControl();
 
+	// Populate controls from a RasterLayer's wavelength info and current render params
+	void setActiveLayer(RasterLayer* layer);
+	RasterLayer* activeLayer() const;
 
 public Q_SLOTS:
 
+Q_SIGNALS:
+	// Emitted when user changes any of the R/G/B wavelength values
+	void bandSelectionChanged(double rWave, double gWave, double bWave);
+
+private Q_SLOTS:
+	void onSpinRedChanged(double val);
+	void onSpinGreenChanged(double val);
+	void onSpinBlueChanged(double val);
+	void onSliderRedChanged(int val);
+	void onSliderGreenChanged(int val);
+	void onSliderBlueChanged(int val);
+	void onTrueColorClicked();
+	void onColorInfraredClicked();
+
 private:
+	void emitBandChange();
+	void blockAllSignals(bool block);
+
 	Ui::ImageControl ui;
+	RasterLayer* m_activeLayer = nullptr;
+	double m_minWave = 374.5;
+	double m_maxWave = 948.1;
 };