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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "ui/views/controls/resize_area.h"
      6 
      7 #include "base/logging.h"
      8 #include "ui/accessibility/ax_view_state.h"
      9 #include "ui/base/cursor/cursor.h"
     10 #include "ui/base/resource/resource_bundle.h"
     11 #include "ui/views/controls/resize_area_delegate.h"
     12 #include "ui/views/native_cursor.h"
     13 
     14 namespace views {
     15 
     16 const char ResizeArea::kViewClassName[] = "ResizeArea";
     17 
     18 ////////////////////////////////////////////////////////////////////////////////
     19 // ResizeArea
     20 
     21 ResizeArea::ResizeArea(ResizeAreaDelegate* delegate)
     22     : delegate_(delegate),
     23       initial_position_(0) {
     24 }
     25 
     26 ResizeArea::~ResizeArea() {
     27 }
     28 
     29 const char* ResizeArea::GetClassName() const {
     30   return kViewClassName;
     31 }
     32 
     33 gfx::NativeCursor ResizeArea::GetCursor(const ui::MouseEvent& event) {
     34   return enabled() ? GetNativeEastWestResizeCursor()
     35                    : gfx::kNullCursor;
     36 }
     37 
     38 bool ResizeArea::OnMousePressed(const ui::MouseEvent& event) {
     39   if (!event.IsOnlyLeftMouseButton())
     40     return false;
     41 
     42   // The resize area obviously will move once you start dragging so we need to
     43   // convert coordinates to screen coordinates so that we don't lose our
     44   // bearings.
     45   gfx::Point point(event.x(), 0);
     46   View::ConvertPointToScreen(this, &point);
     47   initial_position_ = point.x();
     48 
     49   return true;
     50 }
     51 
     52 bool ResizeArea::OnMouseDragged(const ui::MouseEvent& event) {
     53   if (!event.IsLeftMouseButton())
     54     return false;
     55 
     56   ReportResizeAmount(event.x(), false);
     57   return true;
     58 }
     59 
     60 void ResizeArea::OnMouseReleased(const ui::MouseEvent& event) {
     61   ReportResizeAmount(event.x(), true);
     62 }
     63 
     64 void ResizeArea::OnMouseCaptureLost() {
     65   ReportResizeAmount(initial_position_, true);
     66 }
     67 
     68 void ResizeArea::GetAccessibleState(ui::AXViewState* state) {
     69   state->role = ui::AX_ROLE_SPLITTER;
     70 }
     71 
     72 void ResizeArea::ReportResizeAmount(int resize_amount, bool last_update) {
     73   gfx::Point point(resize_amount, 0);
     74   View::ConvertPointToScreen(this, &point);
     75   resize_amount = point.x() - initial_position_;
     76   delegate_->OnResize(base::i18n::IsRTL() ? -resize_amount : resize_amount,
     77                       last_update);
     78 }
     79 
     80 }  // namespace views
     81