ui/views/controls/resize_area.cc

   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