Drag up/down to set arbitrary FM demod bandwidth

Shouldn't need separate WBFM/FM/NFM setting this way -- Just "FM" and
then set arbitrary bandwidth by dragging.

Also removed redundant demod resampling stages left over from early
experiments.

src/util/MouseTracker.cpp

@@ -15,17 +15,21 @@ void MouseTracker::OnMouseMoved(wxMouseEvent& event) {
     deltaMouseY = mouseY - lastMouseY;
 
     if (isMouseDown) {
-        lastMouseX = mouseX;
-
-        if (vertDragLock && mouseY != lastMouseY) {
-            target->WarpPointer(event.m_x, lastMouseY * ClientSize.y);
-        } else {
-            lastMouseY = mouseY;
+        if (horizDragLock && vertDragLock) {
+            target->WarpPointer(originMouseX * ClientSize.x, originMouseY * ClientSize.y);
+            mouseX = originMouseX;
+            mouseY = originMouseY;
+        } else if (vertDragLock  && mouseY != lastMouseY) {
+            target->WarpPointer(event.m_x, originMouseY * ClientSize.y);
+            mouseY = originMouseY;
+        } else if (horizDragLock && mouseX != lastMouseX) {
+            target->WarpPointer(originMouseX * ClientSize.x, event.m_y);
+            mouseX = originMouseX;
         }
-    } else {
-        lastMouseY = mouseY;
-        lastMouseX = mouseX;
     }
+
+    lastMouseX = mouseX;
+    lastMouseY = mouseY;
 }
 
 void MouseTracker::OnMouseDown(wxMouseEvent& event) {
@@ -105,6 +109,10 @@ void MouseTracker::setVertDragLock(bool dragLock) {
     vertDragLock = dragLock;
 }
 
+void MouseTracker::setHorizDragLock(bool dragLock) {
+    horizDragLock = dragLock;
+}
+
 bool MouseTracker::mouseDown() {
     return isMouseDown;
 }

src/util/MouseTracker.h

@@ -6,13 +6,13 @@ class MouseTracker {
 public:
     MouseTracker(wxWindow *target) :
             target(target), mouseX(0), mouseY(0), lastMouseX(0), lastMouseY(0), originMouseX(0), originMouseY(0), deltaMouseX(0), deltaMouseY(0), isMouseDown(
-                    false), vertDragLock(false), isMouseInView(false) {
+                    false), vertDragLock(false), horizDragLock(false), isMouseInView(false) {
 
     }
 
     MouseTracker() :
             target(NULL), mouseX(0), mouseY(0), lastMouseX(0), lastMouseY(0), originMouseX(0), originMouseY(0), deltaMouseX(0), deltaMouseY(0), isMouseDown(
-                    false), vertDragLock(false), isMouseInView(false) {
+                    false), vertDragLock(false), horizDragLock(false), isMouseInView(false) {
 
     }
 
@@ -35,6 +35,7 @@ public:
     float getMouseY();
 
     void setVertDragLock(bool dragLock);
+    void setHorizDragLock(bool dragLock);
     bool mouseDown();
     bool mouseInView();
     void setTarget(wxWindow *target_in);
@@ -46,6 +47,6 @@ private:
     float originMouseX, originMouseY;
 
     bool isMouseDown, isMouseInView;
-    bool vertDragLock;
+    bool vertDragLock, horizDragLock;
     wxWindow *target;
 };

src/util/ThreadQueue.h

@@ -207,6 +207,15 @@ public:
         return m_queue.empty();
     }
 
+    /**
+     *  Remove any items in the queue.
+     */
+    void flush() const {
+        std::lock_guard < std::mutex > lock(m_mutex);
+        std::queue<T, Container> emptyQueue;
+        std::swap(m_queue, emptyQueue);
+    }
+
     /**
      *  Swaps the contents.
      * \param[out] sq The ThreadQueue to swap with 'this'.