Add an activator system to Control

[libs/gui.git] / source / input / control.h

diff --git a/source/input/control.h b/source/input/control.h
index e5679639cf49eabefc9429c1fc83ab32618c60d8..450b057ce30496b27f20ec251d3310163c45ae72 100644 (file)
--- a/source/input/control.h
+++ b/source/input/control.h
@@ -8,6 +8,7 @@
 namespace Msp {
 namespace Input {
 
+class BinaryControl;
 class Device;
 
 enum ControlSrcType
@@ -41,6 +42,11 @@ A control uses either a button or half of an axis (positive or negative) as its
 source.  How the source values are interpreted depends on the exact type of the
 control.  Controls also support interactive binding by capturing a button press
 or axis motion.
+
+A BinaryControl can be used as an activator, requiring that control to be
+active for any events to be processed.  This can be used to implement shifted
+controls (when used on a BinaryControl) or click-and-drag functionality (when
+used on a SmoothControl).
 */
 class Control: public sigc::trackable
 {
@@ -50,6 +56,8 @@ public:
 protected:
        ControlSource src;
        Device *capture_dev;
+       BinaryControl *activator;
+       float origin;
 
        Control();
        Control(const ControlSource &);
@@ -62,6 +70,8 @@ public:
        void set_source(Device &, ControlSrcType, unsigned);
        void set_source(const ControlSource &);
        const ControlSource &get_source() const { return src; }
+       void set_activator(BinaryControl *);
+       BinaryControl *get_activator() const { return activator; }
 protected:
        virtual void on_press() = 0;
        virtual void on_release() = 0;
@@ -72,6 +82,7 @@ private:
        void button_press(unsigned);
        void button_release(unsigned);
        void axis_motion(unsigned, float, float);
+       void deactivate();
 
        Control(const Control &);
        Control &operator=(const Control &);