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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/single_split_view.h" | |
| 6 | |
| 7 #include "skia/ext/skia_utils_win.h" | |
| 8 #include "ui/accessibility/ax_view_state.h" | |
| 9 #include "ui/base/cursor/cursor.h" | |
| 10 #include "ui/gfx/canvas.h" | |
| 11 #include "ui/views/background.h" | |
| 12 #include "ui/views/controls/single_split_view_listener.h" | |
| 13 #include "ui/views/native_cursor.h" | |
| 14 | |
| 15 namespace views { | |
| 16 | |
| 17 // static | |
| 18 const char SingleSplitView::kViewClassName[] = "SingleSplitView"; | |
| 19 | |
| 20 // Size of the divider in pixels. | |
| 21 static const int kDividerSize = 4; | |
| 22 | |
| 23 SingleSplitView::SingleSplitView(View* leading, | |
| 24 View* trailing, | |
| 25 Orientation orientation, | |
| 26 SingleSplitViewListener* listener) | |
| 27 : is_horizontal_(orientation == HORIZONTAL_SPLIT), | |
| 28 divider_offset_(-1), | |
| 29 resize_leading_on_bounds_change_(true), | |
| 30 resize_disabled_(false), | |
| 31 listener_(listener) { | |
| 32 AddChildView(leading); | |
| 33 AddChildView(trailing); | |
| 34 #if defined(OS_WIN) | |
| 35 set_background( | |
| 36 views::Background::CreateSolidBackground( | |
| 37 skia::COLORREFToSkColor(GetSysColor(COLOR_3DFACE)))); | |
| 38 #endif | |
| 39 } | |
| 40 | |
| 41 void SingleSplitView::Layout() { | |
| 42 gfx::Rect leading_bounds; | |
| 43 gfx::Rect trailing_bounds; | |
| 44 CalculateChildrenBounds(bounds(), &leading_bounds, &trailing_bounds); | |
| 45 | |
| 46 if (has_children()) { | |
| 47 if (child_at(0)->visible()) | |
| 48 child_at(0)->SetBoundsRect(leading_bounds); | |
| 49 if (child_count() > 1) { | |
| 50 if (child_at(1)->visible()) | |
| 51 child_at(1)->SetBoundsRect(trailing_bounds); | |
| 52 } | |
| 53 } | |
| 54 | |
| 55 // Invoke super's implementation so that the children are layed out. | |
| 56 View::Layout(); | |
| 57 } | |
| 58 | |
| 59 const char* SingleSplitView::GetClassName() const { | |
| 60 return kViewClassName; | |
| 61 } | |
| 62 | |
| 63 void SingleSplitView::GetAccessibleState(ui::AXViewState* state) { | |
| 64 state->role = ui::AX_ROLE_GROUP; | |
| 65 state->name = accessible_name_; | |
| 66 } | |
| 67 | |
| 68 gfx::Size SingleSplitView::GetPreferredSize() const { | |
| 69 int width = 0; | |
| 70 int height = 0; | |
| 71 for (int i = 0; i < 2 && i < child_count(); ++i) { | |
| 72 const View* view = child_at(i); | |
| 73 gfx::Size pref = view->GetPreferredSize(); | |
| 74 if (is_horizontal_) { | |
| 75 width += pref.width(); | |
| 76 height = std::max(height, pref.height()); | |
| 77 } else { | |
| 78 width = std::max(width, pref.width()); | |
| 79 height += pref.height(); | |
| 80 } | |
| 81 } | |
| 82 if (is_horizontal_) | |
| 83 width += GetDividerSize(); | |
| 84 else | |
| 85 height += GetDividerSize(); | |
| 86 return gfx::Size(width, height); | |
| 87 } | |
| 88 | |
| 89 gfx::NativeCursor SingleSplitView::GetCursor(const ui::MouseEvent& event) { | |
| 90 if (!IsPointInDivider(event.location())) | |
| 91 return gfx::kNullCursor; | |
| 92 return is_horizontal_ ? GetNativeEastWestResizeCursor() | |
| 93 : GetNativeNorthSouthResizeCursor(); | |
| 94 } | |
| 95 | |
| 96 int SingleSplitView::GetDividerSize() const { | |
| 97 bool both_visible = child_count() > 1 && child_at(0)->visible() && | |
| 98 child_at(1)->visible(); | |
| 99 return both_visible && !resize_disabled_ ? kDividerSize : 0; | |
| 100 } | |
| 101 | |
| 102 void SingleSplitView::CalculateChildrenBounds( | |
| 103 const gfx::Rect& bounds, | |
| 104 gfx::Rect* leading_bounds, | |
| 105 gfx::Rect* trailing_bounds) const { | |
| 106 bool is_leading_visible = has_children() && child_at(0)->visible(); | |
| 107 bool is_trailing_visible = child_count() > 1 && child_at(1)->visible(); | |
| 108 | |
| 109 if (!is_leading_visible && !is_trailing_visible) { | |
| 110 *leading_bounds = gfx::Rect(); | |
| 111 *trailing_bounds = gfx::Rect(); | |
| 112 return; | |
| 113 } | |
| 114 | |
| 115 int divider_at; | |
| 116 | |
| 117 if (!is_trailing_visible) { | |
| 118 divider_at = GetPrimaryAxisSize(bounds.width(), bounds.height()); | |
| 119 } else if (!is_leading_visible) { | |
| 120 divider_at = 0; | |
| 121 } else { | |
| 122 divider_at = | |
| 123 CalculateDividerOffset(divider_offset_, this->bounds(), bounds); | |
| 124 divider_at = NormalizeDividerOffset(divider_at, bounds); | |
| 125 } | |
| 126 | |
| 127 int divider_size = GetDividerSize(); | |
| 128 | |
| 129 if (is_horizontal_) { | |
| 130 *leading_bounds = gfx::Rect(0, 0, divider_at, bounds.height()); | |
| 131 *trailing_bounds = | |
| 132 gfx::Rect(divider_at + divider_size, 0, | |
| 133 std::max(0, bounds.width() - divider_at - divider_size), | |
| 134 bounds.height()); | |
| 135 } else { | |
| 136 *leading_bounds = gfx::Rect(0, 0, bounds.width(), divider_at); | |
| 137 *trailing_bounds = | |
| 138 gfx::Rect(0, divider_at + divider_size, bounds.width(), | |
| 139 std::max(0, bounds.height() - divider_at - divider_size)); | |
| 140 } | |
| 141 } | |
| 142 | |
| 143 void SingleSplitView::SetAccessibleName(const base::string16& name) { | |
| 144 accessible_name_ = name; | |
| 145 } | |
| 146 | |
| 147 bool SingleSplitView::OnMousePressed(const ui::MouseEvent& event) { | |
| 148 if (!IsPointInDivider(event.location())) | |
| 149 return false; | |
| 150 drag_info_.initial_mouse_offset = GetPrimaryAxisSize(event.x(), event.y()); | |
| 151 drag_info_.initial_divider_offset = | |
| 152 NormalizeDividerOffset(divider_offset_, bounds()); | |
| 153 return true; | |
| 154 } | |
| 155 | |
| 156 bool SingleSplitView::OnMouseDragged(const ui::MouseEvent& event) { | |
| 157 if (child_count() < 2) | |
| 158 return false; | |
| 159 | |
| 160 int delta_offset = GetPrimaryAxisSize(event.x(), event.y()) - | |
| 161 drag_info_.initial_mouse_offset; | |
| 162 if (is_horizontal_ && base::i18n::IsRTL()) | |
| 163 delta_offset *= -1; | |
| 164 // Honor the first child's minimum size when resizing. | |
| 165 gfx::Size min = child_at(0)->GetMinimumSize(); | |
| 166 int new_size = std::max(GetPrimaryAxisSize(min.width(), min.height()), | |
| 167 drag_info_.initial_divider_offset + delta_offset); | |
| 168 | |
| 169 // Honor the second child's minimum size, and don't let the view | |
| 170 // get bigger than our width. | |
| 171 min = child_at(1)->GetMinimumSize(); | |
| 172 new_size = std::min(GetPrimaryAxisSize() - kDividerSize - | |
| 173 GetPrimaryAxisSize(min.width(), min.height()), new_size); | |
| 174 | |
| 175 if (new_size != divider_offset_) { | |
| 176 set_divider_offset(new_size); | |
| 177 if (!listener_ || listener_->SplitHandleMoved(this)) | |
| 178 Layout(); | |
| 179 } | |
| 180 return true; | |
| 181 } | |
| 182 | |
| 183 void SingleSplitView::OnMouseCaptureLost() { | |
| 184 if (child_count() < 2) | |
| 185 return; | |
| 186 | |
| 187 if (drag_info_.initial_divider_offset != divider_offset_) { | |
| 188 set_divider_offset(drag_info_.initial_divider_offset); | |
| 189 if (!listener_ || listener_->SplitHandleMoved(this)) | |
| 190 Layout(); | |
| 191 } | |
| 192 } | |
| 193 | |
| 194 void SingleSplitView::OnBoundsChanged(const gfx::Rect& previous_bounds) { | |
| 195 divider_offset_ = CalculateDividerOffset(divider_offset_, previous_bounds, | |
| 196 bounds()); | |
| 197 } | |
| 198 | |
| 199 bool SingleSplitView::IsPointInDivider(const gfx::Point& p) { | |
| 200 if (resize_disabled_) | |
| 201 return false; | |
| 202 | |
| 203 if (child_count() < 2) | |
| 204 return false; | |
| 205 | |
| 206 if (!child_at(0)->visible() || !child_at(1)->visible()) | |
| 207 return false; | |
| 208 | |
| 209 int divider_relative_offset; | |
| 210 if (is_horizontal_) { | |
| 211 divider_relative_offset = | |
| 212 p.x() - child_at(base::i18n::IsRTL() ? 1 : 0)->width(); | |
| 213 } else { | |
| 214 divider_relative_offset = p.y() - child_at(0)->height(); | |
| 215 } | |
| 216 return (divider_relative_offset >= 0 && | |
| 217 divider_relative_offset < GetDividerSize()); | |
| 218 } | |
| 219 | |
| 220 int SingleSplitView::CalculateDividerOffset( | |
| 221 int divider_offset, | |
| 222 const gfx::Rect& previous_bounds, | |
| 223 const gfx::Rect& new_bounds) const { | |
| 224 if (resize_leading_on_bounds_change_ && divider_offset != -1) { | |
| 225 // We do not update divider_offset on minimize (to zero) and on restore | |
| 226 // (to largest value). As a result we get back to the original value upon | |
| 227 // window restore. | |
| 228 bool is_minimize_or_restore = | |
| 229 previous_bounds.height() == 0 || new_bounds.height() == 0; | |
| 230 if (!is_minimize_or_restore) { | |
| 231 if (is_horizontal_) | |
| 232 divider_offset += new_bounds.width() - previous_bounds.width(); | |
| 233 else | |
| 234 divider_offset += new_bounds.height() - previous_bounds.height(); | |
| 235 | |
| 236 if (divider_offset < 0) | |
| 237 divider_offset = GetDividerSize(); | |
| 238 } | |
| 239 } | |
| 240 return divider_offset; | |
| 241 } | |
| 242 | |
| 243 int SingleSplitView::NormalizeDividerOffset(int divider_offset, | |
| 244 const gfx::Rect& bounds) const { | |
| 245 int primary_axis_size = GetPrimaryAxisSize(bounds.width(), bounds.height()); | |
| 246 if (divider_offset < 0) | |
| 247 // primary_axis_size may < GetDividerSize during initial layout. | |
| 248 return std::max(0, (primary_axis_size - GetDividerSize()) / 2); | |
| 249 return std::min(divider_offset, | |
| 250 std::max(primary_axis_size - GetDividerSize(), 0)); | |
| 251 } | |
| 252 | |
| 253 } // namespace views | |
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