From 398f3df8af02047a76ab7172c69d93313250260c Mon Sep 17 00:00:00 2001
From: Stijn Buys <ingar@osirion.org>
Date: Sun, 29 Jan 2012 13:51:31 +0000
Subject: FS#80 Have mouse focus stick to the widget when the mouse button is
 down.

---
 src/ui/ui.cc     | 15 +++++++++++++--
 src/ui/ui.h      |  1 +
 src/ui/widget.cc | 18 ++++++++++++++++++
 src/ui/widget.h  | 10 +++++++---
 src/ui/window.cc |  2 +-
 5 files changed, 40 insertions(+), 6 deletions(-)

(limited to 'src')

diff --git a/src/ui/ui.cc b/src/ui/ui.cc
index 4977d03..e10d77a 100644
--- a/src/ui/ui.cc
+++ b/src/ui/ui.cc
@@ -87,6 +87,8 @@ UI::UI() : Window(0)
 
 	mouse_pointer_color = Palette::Pointer;
 	mouse_pointer_bitmap.assign("pointer");
+	
+	mouse_buttonleft_pressed = false;
 }
 
 UI::~UI()
@@ -249,12 +251,18 @@ void UI::list_visible() const
 void UI::frame()
 {
 	ui_input_focus = find_input_focus();
-	Widget *f = find_mouse_focus(mouse_cursor);
+	
+	Widget *f = 0;
+	if (!mouse_buttonleft_pressed) {
+		f = find_mouse_focus(mouse_cursor);
+	} else {
+		f = find_visible_child(ui_mouse_focus);
+	}
 	if (f) {
 		f->event_mouse(mouse_cursor);
 	}
 	ui_mouse_focus = f;
-
+	
 	// reset mouse pointer
 	ui::root()->set_pointer("pointer");
 	
@@ -288,6 +296,9 @@ bool UI::input_key(const bool pressed, const int key, const unsigned int modifie
 		ui_input_focus = f;
 		
 	} else if (key < 564) {
+		if ( key == 512 + SDL_BUTTON_LEFT) {
+			mouse_buttonleft_pressed = pressed;
+		}			
 		// mouse buttons
 		Widget *f = find_mouse_focus(mouse_cursor);
 		if (f) {
diff --git a/src/ui/ui.h b/src/ui/ui.h
index cd2e38c..77b04f5 100644
--- a/src/ui/ui.h
+++ b/src/ui/ui.h
@@ -117,6 +117,7 @@ private:
 	std::string		mouse_pointer_bitmap;
 	Palette::Color		mouse_pointer_color;
 	bool			mouse_pointer_animated;
+	bool			mouse_buttonleft_pressed;
 };
 
 /// initialize the user interface
diff --git a/src/ui/widget.cc b/src/ui/widget.cc
index 6d0fb84..7cde03b 100644
--- a/src/ui/widget.cc
+++ b/src/ui/widget.cc
@@ -366,6 +366,24 @@ Widget *Widget::find_input_focus()
 	return this;
 }
 
+Widget *Widget::find_visible_child(const Widget *widget)
+{
+	if (!visible())
+		return 0;
+	
+	if (this == widget)
+		return this;
+
+	// search in reverse drawing order
+	for (Children::reverse_iterator rit = widget_children.rbegin(); rit != widget_children.rend(); ++rit) {
+		Widget *f = (*rit)->find_visible_child(widget);
+		if (f) {
+			return f;
+		}
+	}
+	return 0;
+}
+
 Widget *Widget::find_mouse_focus(const math::Vector2f & pos)
 {
 	// this widget is not visible
diff --git a/src/ui/widget.h b/src/ui/widget.h
index 77a84c2..ada1f5b 100644
--- a/src/ui/widget.h
+++ b/src/ui/widget.h
@@ -38,8 +38,9 @@ public:
 		EventListItemClicked = 2, 
 		EventListViewChanged = 3, 
 		EventSliderChanged = 4,
-		EventWindowShow = 5,
-		EventWindowHide = 6
+		EventScrollBarChanged = 5,
+		EventWindowShow = 6,
+		EventWindowHide = 7
 	};
 	
 	/// create a new widget
@@ -287,7 +288,7 @@ public:
 	}
 
 protected:
-	
+		
 	/// find the widget that has input focus
 	virtual Widget *find_input_focus();
 
@@ -295,6 +296,9 @@ protected:
 	/** @param cursor mouse cursor position relative to this widget's location
 	*/
 	Widget *find_mouse_focus(const math::Vector2f & cursor);
+	
+	/// find a visible widget 
+	Widget *find_visible_child(const Widget *widget);
 
 	/// list widget content
 	size_t list(const size_t indent,  const bool visible_only = false) const;
diff --git a/src/ui/window.cc b/src/ui/window.cc
index 97792bc..325f974 100644
--- a/src/ui/window.cc
+++ b/src/ui/window.cc
@@ -25,7 +25,7 @@ Window::~Window()
 
 void Window::show()
 {
-	resize();
+	event_resize();
 	Widget::show();
 	//raise();
 	Widget *w = this;
-- 
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