From: Tilman Sauerbeck <tilman@code-monkey.de>
Date: Sat, 7 Nov 2015 14:31:08 +0000 (+0100)
Subject: Add a mechanism to make ViewItem classes immovable.
X-Git-Url: http://git.code-monkey.de/?p=pulseview.git;a=commitdiff_plain;h=a009d21992db132679e27030736ed614522245ea

Add a mechanism to make ViewItem classes immovable.

This adds a new method ViewItem::is_draggable(), which returns
true iff the view item is supposed to be draggable/movable.

Also, ViewItem::drag() is turned into a nop if the item is
not draggable.
---

diff --git a/pv/view/viewitem.cpp b/pv/view/viewitem.cpp
index a63d4d3..e9602f8 100644
--- a/pv/view/viewitem.cpp
+++ b/pv/view/viewitem.cpp
@@ -49,6 +49,11 @@ void ViewItem::select(bool select)
 	selected_ = select;
 }
 
+bool ViewItem::is_draggable() const
+{
+	return true;
+}
+
 bool ViewItem::dragging() const
 {
 	return drag_point_.x() != INT_MIN && drag_point_.y() != INT_MIN;
@@ -56,7 +61,8 @@ bool ViewItem::dragging() const
 
 void ViewItem::drag()
 {
-	drag_point_ = point(QRect());
+	if (is_draggable())
+		drag_point_ = point(QRect());
 }
 
 void ViewItem::drag_release()
diff --git a/pv/view/viewitem.hpp b/pv/view/viewitem.hpp
index 648be84..16b34cb 100644
--- a/pv/view/viewitem.hpp
+++ b/pv/view/viewitem.hpp
@@ -68,6 +68,11 @@ public:
 	 */
 	virtual void select(bool select = true);
 
+	/**
+	  Returns true if the item may be dragged/moved.
+	 */
+	virtual bool is_draggable() const;
+
 	/**
 	 * Returns true if the item is being dragged.
 	 */