Mini doc of QuadSplitter widget

//set/get border width
int spacing() const;
void setSpacing(int spacing);

//set/get splitters width
int splittersSpacing() const;
void setSplittersSpacing(int spacing);

//set/get center place width(distance of dragging begins and show cross cursor)
int centerPartWidth() const;
void setCenterPartWidth(int value);

//set/get minimum widget size (minimumSize and maximumSize of controls also works, this function using as
//additional flexibility):
int minimumWidgetSize() const;
void setMinimumWidgetSize(int value);