Add chrome to the repository.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@15 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 126 insertions, 0 deletions

diff --git a/chrome/views/scroll_bar.h b/chrome/views/scroll_bar.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef CHROME_VIEWS_SCROLLBAR_H__
+#define CHROME_VIEWS_SCROLLBAR_H__
+
+#include "chrome/views/view.h"
+#include "chrome/views/event.h"
+
+namespace ChromeViews {
+
+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_;
+};
+
+}
+#endif