Add more customization support to CANDataGrid. Used that new functionality in Flow View

to allow for bitfield triggers. Click a cell to trigger on it.
Now playback will stop if that cell changes state while playing back.

candatagrid.h

@@ -7,6 +7,27 @@ namespace Ui {
 class CANDataGrid;
 }
 
+/*
+ * CANDataGrid is a custom QT widget that proves that it's possible to shoehorn 12x too much crap into one widget. The purported
+ * goal of the widget was to show an 8x8 grid of bits that show whether each bit in a given message is set or not. It allows one to quickly
+ * visualize the bits within a CAN frame's data bytes. From there it evolved to also show whether a given bit was freshly set recently, freshly
+ * unset recently, or has stayed set or unset for a while. It can also gray out bytes that don't exist in the current CAN frame.
+ * This is handled by the calling code.
+ *
+ * After that functionality was added so it could also emit a signal when it is clicked. The signal will tell you which "bit" cell was clicked.
+ *
+ * Then, support was added for modifying the text color of each cell. This can be used for whatever the calling code wants. An example is
+ * FlowView that uses all of the above functionality plus this functionality in order to show which bits are set as triggers for stopping
+ * the flowview playback.
+ */
+
+enum GridTextState
+{
+    NORMAL,
+    BOLD_BLUE,
+    INVERT
+};
+
 class CANDataGrid : public QWidget
 {
     Q_OBJECT
@@ -19,6 +40,8 @@ public:
     void updateData(unsigned char *, bool);
     void setUsed(unsigned char *, bool);
     void saveImage(QString filename, int width, int height);
+    void setCellTextState(int x, int y, GridTextState state);
+    GridTextState geCellTextState(int x, int y);
 
 protected:
     void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
@@ -31,6 +54,7 @@ private:
     unsigned char refData[8];
     unsigned char data[8];
     unsigned char usedData[8];
+    GridTextState textStates[8][8];
     QPoint upperLeft, gridSize;
 };