* BMenu now scrolls when you press page up/down, if possible.

* BMenuWindow no longer uses a fixed scroll step - instead, the menu sets it
  to the height of its first item.
* Cleanup.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@31389 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/interface/MenuWindow.h

@@ -1,13 +1,13 @@
 /*
- * Copyright 2001-2006, Haiku, Inc.
+ * Copyright 2001-2009, Haiku, Inc.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
  *		Marc Flerackers ([email protected])
  *		Stefano Ceccherini ([email protected])
  */
-#ifndef __MENUWINDOW_H
+#ifndef MENU_WINDOW_H
-#define __MENUWINDOW_H
+#define MENU_WINDOW_H
 
 
 #include <Window.h>
@@ -22,34 +22,39 @@ class BMenuScroller;
 
 
 class BMenuWindow : public BWindow {
-	public:
+public:
-		BMenuWindow(const char *name);
+							BMenuWindow(const char* name);
 	virtual					~BMenuWindow();
 
-		virtual void DispatchMessage(BMessage *message, BHandler *handler);
+	virtual	void			DispatchMessage(BMessage* message,
+								BHandler* handler);
 
-		void AttachMenu(BMenu *menu);
+			void			AttachMenu(BMenu* menu);
 			void			DetachMenu();
 
 			void			AttachScrollers();
 			void			DetachScrollers();
 
-		bool CheckForScrolling(const BPoint &cursor);
+			void			SetSmallStep(float step);
-		bool TryScrollBy(const float &step);
+			void			GetSteps(float* _smallStep, float* _largeStep);
+			bool			HasScrollers() const;
+			bool			CheckForScrolling(const BPoint& cursor);
+			bool			TryScrollBy(const float& step);
 
-	private:
+private:
-		BMenu *fMenu;
+			bool			_Scroll(const BPoint& cursor);
-		BMenuFrame *fMenuFrame;
+			void			_ScrollBy(const float& step);
-		BMenuScroller *fUpperScroller;
-		BMenuScroller *fLowerScroller;
 
+			BMenu*			fMenu;
+			BMenuFrame*		fMenuFrame;
+			BMenuScroller*	fUpperScroller;
+			BMenuScroller*	fLowerScroller;
+
+			float			fScrollStep;
 			float			fValue;
 			float			fLimit;
-		
-		bool _Scroll(const BPoint &cursor);
-		void _ScrollBy(const float &step);
 };
 
 }	// namespace BPrivate
 
-#endif	// __MENUWINDOW_H
+#endif	// MENU_WINDOW_H

src/kits/interface/Menu.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright 2001-2008, Haiku, Inc.
+ * Copyright 2001-2009, Haiku, Inc.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -8,6 +8,8 @@
  *		Rene Gollent ([email protected])
  */
 
+#include <Menu.h>
+
 #include <new>
 #include <ctype.h>
 #include <string.h>
@@ -18,13 +20,13 @@
 #include <FindDirectory.h>
 #include <Layout.h>
 #include <LayoutUtils.h>
-#include <Menu.h>
 #include <MenuBar.h>
 #include <MenuItem.h>
 #include <Messenger.h>
 #include <Path.h>
 #include <PropertyInfo.h>
 #include <Screen.h>
+#include <ScrollBar.h>
 #include <Window.h>
 
 #include <AppServerLink.h>
@@ -819,9 +821,7 @@ BMenu::MessageReceived(BMessage *msg)
 	switch (msg->what) {
 		case B_MOUSE_WHEEL_CHANGED:
 		{
-			//float deltaX = 0
 			float deltaY = 0;
-			//msg->FindFloat("be:wheel_delta_x", &deltaX);
 			msg->FindFloat("be:wheel_delta_y", &deltaY);
 			if (deltaY == 0)
 				return;
@@ -830,7 +830,9 @@ BMenu::MessageReceived(BMessage *msg)
 			if (window == NULL)
 				return;
 
-			window->TryScrollBy(deltaY);
+			float smallStep;
+			window->GetSteps(&smallStep, NULL);
+			window->TryScrollBy(deltaY * smallStep);
 			break;
 		}
 		default:
@@ -890,6 +892,21 @@ BMenu::KeyDown(const char *bytes, int32 numBytes)
 			}
 			break;
 
+		case B_PAGE_UP:
+		case B_PAGE_DOWN:
+		{
+			BMenuWindow *window = dynamic_cast<BMenuWindow *>(Window());
+			if (window == NULL || !window->HasScrollers())
+				break;
+
+			int32 deltaY = bytes[0] == B_PAGE_UP ? -1 : 1;
+
+			float largeStep;
+			window->GetSteps(NULL, &largeStep);
+			window->TryScrollBy(deltaY * largeStep);
+			break;
+		}
+
 		case B_ENTER:
 		case B_SPACE:
 			if (fSelected) {
@@ -1426,6 +1443,13 @@ BMenu::_Show(bool selectFirstItem)
 		fAttachAborted = false;
 		window->AttachMenu(this);
 
+		if (ItemAt(0) != NULL) {
+			float width, height;
+			ItemAt(0)->GetContentSize(&width, &height);
+
+			window->SetSmallStep(ceilf(height));
+		}
+
 		// Menu didn't have the time to add its items: aborting...
 		if (fAttachAborted) {
 			window->DetachMenu();

src/kits/interface/MenuWindow.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright 2001-2007, Haiku, Inc.
+ * Copyright 2001-2009, Haiku, Inc.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -14,6 +14,8 @@
 #include <ControlLook.h>
 #include <Debug.h>
 #include <Menu.h>
+#include <MenuItem.h>
+
 #include <MenuPrivate.h>
 #include <WindowPrivate.h>
 
@@ -67,7 +69,6 @@ using namespace BPrivate;
 
 
 const int kScrollerHeight = 10;
-const int kScrollStep = 19;
 
 
 BMenuScroller::BMenuScroller(BRect frame)
@@ -243,7 +244,8 @@ BMenuWindow::BMenuWindow(const char *name)
 	fMenu(NULL),
 	fMenuFrame(NULL),
 	fUpperScroller(NULL),
-	fLowerScroller(NULL)
+	fLowerScroller(NULL),
+	fScrollStep(19)
 {
 	SetSizeLimits(2, 10000, 2, 10000);
 }
@@ -347,6 +349,35 @@ BMenuWindow::DetachScrollers()
 }
 
 
+void
+BMenuWindow::SetSmallStep(float step)
+{
+	fScrollStep = step;
+}
+
+
+void
+BMenuWindow::GetSteps(float* _smallStep, float* _largeStep)
+{
+	if (_smallStep != NULL)
+		*_smallStep = fScrollStep;
+	if (_largeStep != NULL) {
+		if (fMenuFrame != NULL)
+			*_largeStep = fMenuFrame->Bounds().Height() - fScrollStep;
+		else
+			*_largeStep = fScrollStep * 2;
+	}
+}
+
+
+bool
+BMenuWindow::HasScrollers() const
+{
+	return fMenuFrame != NULL && fUpperScroller != NULL
+		&& fLowerScroller != NULL;
+}
+
+
 bool
 BMenuWindow::CheckForScrolling(const BPoint &cursor)
 {
@@ -358,19 +389,18 @@ BMenuWindow::CheckForScrolling(const BPoint &cursor)
 
 
 bool
-BMenuWindow::TryScrollBy(const float &step)
+BMenuWindow::TryScrollBy(const float& step)
 {
 	if (!fMenuFrame || !fUpperScroller || !fLowerScroller)
 		return false;
 
 	_ScrollBy(step);
-	
 	return true;
 }
 
 
 bool
-BMenuWindow::_Scroll(const BPoint &where)
+BMenuWindow::_Scroll(const BPoint& where)
 {
 	ASSERT((fLowerScroller != NULL));
 	ASSERT((fUpperScroller != NULL));
@@ -380,11 +410,11 @@ BMenuWindow::_Scroll(const BPoint &where)
 	BRect lowerFrame = fLowerScroller->Frame();
 	BRect upperFrame = fUpperScroller->Frame();
 
-	if (fLowerScroller->IsEnabled() && lowerFrame.Contains(cursor)) {		
+	if (fLowerScroller->IsEnabled() && lowerFrame.Contains(cursor))
 		_ScrollBy(1);
-	} else if (fUpperScroller->IsEnabled() && upperFrame.Contains(cursor)) {		
+	else if (fUpperScroller->IsEnabled() && upperFrame.Contains(cursor))
 		_ScrollBy(-1);
-	} else
+	else
 		return false;
 
 	snooze(5000);
@@ -394,7 +424,7 @@ BMenuWindow::_Scroll(const BPoint &where)
 
 
 void
-BMenuWindow::_ScrollBy(const float &step)
+BMenuWindow::_ScrollBy(const float& step)
 {
 	if (step > 0) {
 		if (fValue == 0) {
@@ -402,17 +432,15 @@ BMenuWindow::_ScrollBy(const float &step)
 			fUpperScroller->Invalidate();
 		}
 
-		if (fValue + kScrollStep >= fLimit) {
+		if (fValue + step >= fLimit) {
-			// If we reached the limit, we don't want to scroll a whole
+			// If we reached the limit, only scroll to the end
-			// 'step' if not needed.
 			fMenu->ScrollBy(0, fLimit - fValue);
 			fValue = fLimit;
 			fLowerScroller->SetEnabled(false);
 			fLowerScroller->Invalidate();
-
 		} else {
-			fMenu->ScrollBy(0, kScrollStep);
+			fMenu->ScrollBy(0, step);
-			fValue += kScrollStep;
+			fValue += step;
 		}
 	} else if (step < 0) {
 		if (fValue == fLimit) {
@@ -420,15 +448,14 @@ BMenuWindow::_ScrollBy(const float &step)
 			fLowerScroller->Invalidate();
 		}
 
-		if (fValue - kScrollStep <= 0) {
+		if (fValue + step <= 0) {
 			fMenu->ScrollBy(0, -fValue);
 			fValue = 0;
 			fUpperScroller->SetEnabled(false);
 			fUpperScroller->Invalidate();
-
 		} else {
-			fMenu->ScrollBy(0, -kScrollStep);
+			fMenu->ScrollBy(0, step);
-			fValue -= kScrollStep;
+			fValue += step;
 		}
 	}
 }