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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/views/controls/resize_area_delegate.h"
     11 #include "ui/views/native_cursor.h"
     12 
     13 namespace views {
     14 
     15 const char ResizeArea::kViewClassName[] = "ResizeArea";
     16 
     17 ////////////////////////////////////////////////////////////////////////////////
     18 // ResizeArea
     19 
     20 ResizeArea::ResizeArea(ResizeAreaDelegate* delegate)
     21     : delegate_(delegate),
     22       initial_position_(0) {
     23 }
     24 
     25 ResizeArea::~ResizeArea() {
     26 }
     27 
     28 const char* ResizeArea::GetClassName() const {
     29   return kViewClassName;
     30 }
     31 
     32 gfx::NativeCursor ResizeArea::GetCursor(const ui::MouseEvent& event) {
     33   return enabled() ? GetNativeEastWestResizeCursor()
     34                    : gfx::kNullCursor;
     35 }
     36 
     37 bool ResizeArea::OnMousePressed(const ui::MouseEvent& event) {
     38   if (!event.IsOnlyLeftMouseButton())
     39     return false;
     40 
     41   // The resize area obviously will move once you start dragging so we need to
     42   // convert coordinates to screen coordinates so that we don't lose our
     43   // bearings.
     44   gfx::Point point(event.x(), 0);
     45   View::ConvertPointToScreen(this, &point);
     46   initial_position_ = point.x();
     47 
     48   return true;
     49 }
     50 
     51 bool ResizeArea::OnMouseDragged(const ui::MouseEvent& event) {
     52   if (!event.IsLeftMouseButton())
     53     return false;
     54 
     55   ReportResizeAmount(event.x(), false);
     56   return true;
     57 }
     58 
     59 void ResizeArea::OnMouseReleased(const ui::MouseEvent& event) {
     60   ReportResizeAmount(event.x(), true);
     61 }
     62 
     63 void ResizeArea::OnMouseCaptureLost() {
     64   ReportResizeAmount(initial_position_, true);
     65 }
     66 
     67 void ResizeArea::GetAccessibleState(ui::AXViewState* state) {
     68   state->role = ui::AX_ROLE_SPLITTER;
     69 }
     70 
     71 void ResizeArea::ReportResizeAmount(int resize_amount, bool last_update) {
     72   gfx::Point point(resize_amount, 0);
     73   View::ConvertPointToScreen(this, &point);
     74   resize_amount = point.x() - initial_position_;
     75   delegate_->OnResize(base::i18n::IsRTL() ? -resize_amount : resize_amount,
     76                       last_update);
     77 }
     78 
     79 }  // namespace views
     80