Move src/chrome/views to src/views. RS=darin http://crbug.com/11387

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@15604 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 102 insertions, 0 deletions

diff --git a/views/controls/scrollbar/scroll_bar.h b/views/controls/scrollbar/scroll_bar.h
new file mode 100644
index 0000000..36a9d2e
--- /dev/null
+++ b/views/controls/scrollbar/scroll_bar.h
@@ -0,0 +1,102 @@
+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef VIEWS_CONTROLS_SCROLLBAR_SCROLLBAR_H_
+#define VIEWS_CONTROLS_SCROLLBAR_SCROLLBAR_H_
+
+#include "views/view.h"
+#include "views/event.h"
+
+namespace views {
+
+class ScrollBar;
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// ScrollBarController
+//
+// ScrollBarController defines the method that should be implemented to
+// receive notification from a scrollbar
+//
+/////////////////////////////////////////////////////////////////////////////
+class ScrollBarController {
+ public:
+
+  // Invoked by the scrollbar when the scrolling position changes
+  // This method typically implements the actual scrolling.
+  //
+  // The provided position is expressed in pixels. It is the new X or Y
+  // position which is in the GetMinPosition() / GetMaxPosition range.
+  virtual void ScrollToPosition(ScrollBar* source, int position) = 0;
+
+  // Returns the amount to scroll. The amount to scroll may be requested in
+  // two different amounts. If is_page is true the 'page scroll' amount is
+  // requested. The page scroll amount typically corresponds to the
+  // visual size of the view. If is_page is false, the 'line scroll' amount
+  // is being requested. The line scroll amount typically corresponds to the
+  // size of one row/column.
+  //
+  // The return value should always be positive. A value <= 0 results in
+  // scrolling by a fixed amount.
+  virtual int GetScrollIncrement(ScrollBar* source,
+                                 bool is_page,
+                                 bool is_positive) = 0;
+};
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// ScrollBar
+//
+// A View subclass to wrap to implement a ScrollBar. Our current windows
+// version simply wraps a native windows scrollbar.
+//
+// A scrollbar is either horizontal or vertical
+//
+/////////////////////////////////////////////////////////////////////////////
+class ScrollBar : public View {
+ public:
+  virtual ~ScrollBar();
+
+  // Return whether this scrollbar is horizontal
+  bool IsHorizontal() const;
+
+  // Set / Get the controller
+  void SetController(ScrollBarController* controller);
+  ScrollBarController* GetController() const;
+
+  // Update the scrollbar appearance given a viewport size, content size and
+  // current position
+  virtual void Update(int viewport_size, int content_size, int current_pos);
+
+  // Return the max and min positions
+  int GetMaxPosition() const;
+  int GetMinPosition() const;
+
+  // Returns the position of the scrollbar.
+  virtual int GetPosition() const = 0;
+
+  // Get the width or height of this scrollbar, for use in layout calculations.
+  // For a vertical scrollbar, this is the width of the scrollbar, likewise it
+  // is the height for a horizontal scrollbar.
+  virtual int GetLayoutSize() const = 0;
+
+ protected:
+  // Create new scrollbar, either horizontal or vertical. These are protected
+  // since you need to be creating either a NativeScrollBar or a
+  // BitmapScrollBar.
+  ScrollBar(bool is_horiz);
+
+ private:
+  const bool is_horiz_;
+
+  // Current controller
+  ScrollBarController* controller_;
+
+  // properties
+  int max_pos_;
+};
+
+}  // namespace views
+
+#endif  // #ifndef VIEWS_CONTROLS_SCROLLBAR_SCROLLBAR_H_