(svn r20458) -Codechange: Move Scrollbar from window.cpp to widget.cpp

1 files changed, 32 insertions, 0 deletions

diff --git a/src/widget.cpp b/src/widget.cpp
index 7c6447d0a..698217670 100644
--- a/src/widget.cpp
+++ b/src/widget.cpp
@@ -1633,6 +1633,38 @@ void NWidgetViewport::UpdateViewportCoordinates(Window *w)
 }
 
 /**
+ * Compute the row of a scrolled widget that a user clicked in.
+ * @param clickpos    Vertical position of the mouse click (without taking scrolling into account).
+ * @param widget      Widget number of the widget clicked in.
+ * @param padding     Amount of empty space between the widget edge and the top of the first row. Default value is \c 0.
+ * @param line_height Height of a single row. A negative value means using the vertical resize step of the widget.
+ * @return Row number clicked at. If clicked at a wrong position, #INT_MAX is returned.
+ */
+int Scrollbar::GetScrolledRowFromWidget(int clickpos, const Window * const w, int widget, int padding, int line_height) const
+{
+	uint pos = w->GetRowFromWidget(clickpos, widget, padding, line_height);
+	if (pos != INT_MAX) pos += this->GetPosition();
+	return (pos >= this->GetCount()) ? INT_MAX : pos;
+}
+
+/**
+ * Set capacity of visible elements from the size and resize properties of a widget.
+ * @param w       Window.
+ * @param widget  Widget with size and resize properties.
+ * @param padding Padding to subtract from the size.
+ * @note Updates the position if needed.
+ */
+void Scrollbar::SetCapacityFromWidget(Window *w, int widget, int padding)
+{
+	NWidgetBase *nwid = w->GetWidget<NWidgetBase>(widget);
+	if (this->is_vertical) {
+		this->SetCapacity(((int)nwid->current_y - padding) / (int)nwid->resize_y);
+	} else {
+		this->SetCapacity(((int)nwid->current_x - padding) / (int)nwid->resize_x);
+	}
+}
+
+/**
  * Scrollbar widget.
  * @param tp     Scrollbar type. (horizontal/vertical)
  * @param colour Colour of the scrollbar.