src/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/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