dropdown_bar_host.cc revision 868fa2fe829687343ffae624259930155e16dbd8
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 "chrome/browser/ui/views/dropdown_bar_host.h" 6 7#include <algorithm> 8 9#include "chrome/browser/ui/view_ids.h" 10#include "chrome/browser/ui/views/dropdown_bar_host_delegate.h" 11#include "chrome/browser/ui/views/dropdown_bar_view.h" 12#include "chrome/browser/ui/views/frame/browser_view.h" 13#include "ui/base/animation/slide_animation.h" 14#include "ui/base/keycodes/keyboard_codes.h" 15#include "ui/gfx/path.h" 16#include "ui/gfx/scrollbar_size.h" 17#include "ui/views/focus/external_focus_tracker.h" 18#include "ui/views/focus/view_storage.h" 19#include "ui/views/widget/widget.h" 20 21#if defined(USE_AURA) 22#include "ui/gfx/scoped_sk_region.h" 23#elif defined(OS_WIN) 24#include "base/win/scoped_gdi_object.h" 25#endif 26 27namespace { 28 29#if defined(USE_AURA) 30typedef gfx::ScopedSkRegion ScopedPlatformRegion; 31#elif defined(OS_WIN) 32typedef base::win::ScopedRegion ScopedPlatformRegion; 33#endif 34 35} // namespace 36 37using gfx::Path; 38 39// static 40bool DropdownBarHost::disable_animations_during_testing_ = false; 41 42//////////////////////////////////////////////////////////////////////////////// 43// DropdownBarHost, public: 44 45DropdownBarHost::DropdownBarHost(BrowserView* browser_view) 46 : browser_view_(browser_view), 47 view_(NULL), 48 delegate_(NULL), 49 animation_offset_(0), 50 focus_manager_(NULL), 51 esc_accel_target_registered_(false), 52 is_visible_(false) { 53} 54 55void DropdownBarHost::Init(views::View* host_view, 56 views::View* view, 57 DropdownBarHostDelegate* delegate) { 58 DCHECK(view); 59 DCHECK(delegate); 60 61 view_ = view; 62 delegate_ = delegate; 63 64 // Initialize the host. 65 host_.reset(new views::Widget); 66 views::Widget::InitParams params(views::Widget::InitParams::TYPE_CONTROL); 67 params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET; 68 params.parent = browser_view_->GetWidget()->GetNativeView(); 69#if defined(USE_AURA) 70 params.transparent = true; 71#endif 72 host_->Init(params); 73 host_->SetContentsView(view_); 74 75 SetHostViewNative(host_view); 76 77 // Start listening to focus changes, so we can register and unregister our 78 // own handler for Escape. 79 focus_manager_ = host_->GetFocusManager(); 80 if (focus_manager_) { 81 focus_manager_->AddFocusChangeListener(this); 82 } else { 83 // In some cases (see bug http://crbug.com/17056) it seems we may not have 84 // a focus manager. Please reopen the bug if you hit this. 85 NOTREACHED(); 86 } 87 88 // Start the process of animating the opening of the widget. 89 animation_.reset(new ui::SlideAnimation(this)); 90} 91 92DropdownBarHost::~DropdownBarHost() { 93 focus_manager_->RemoveFocusChangeListener(this); 94 focus_tracker_.reset(NULL); 95} 96 97void DropdownBarHost::Show(bool animate) { 98 // Stores the currently focused view, and tracks focus changes so that we can 99 // restore focus when the dropdown widget is closed. 100 focus_tracker_.reset(new views::ExternalFocusTracker(view_, focus_manager_)); 101 102 if (!animate || disable_animations_during_testing_) { 103 is_visible_ = true; 104 animation_->Reset(1); 105 AnimationProgressed(animation_.get()); 106 } else { 107 if (!is_visible_) { 108 // Don't re-start the animation. 109 is_visible_ = true; 110 animation_->Reset(); 111 animation_->Show(); 112 } 113 } 114} 115 116void DropdownBarHost::SetFocusAndSelection() { 117 delegate_->SetFocusAndSelection(true); 118} 119 120bool DropdownBarHost::IsAnimating() const { 121 return animation_->is_animating(); 122} 123 124void DropdownBarHost::Hide(bool animate) { 125 if (!IsVisible()) 126 return; 127 if (animate && !disable_animations_during_testing_ && 128 !animation_->IsClosing()) { 129 animation_->Hide(); 130 } else { 131 if (animation_->IsClosing()) { 132 // If we're in the middle of a close animation, skip immediately to the 133 // end of the animation. 134 StopAnimation(); 135 } else { 136 // Otherwise we need to set both the animation state to ended and the 137 // DropdownBarHost state to ended/hidden, otherwise the next time we try 138 // to show the bar, it might refuse to do so. Note that we call 139 // AnimationEnded ourselves as Reset does not call it if we are not 140 // animating here. 141 animation_->Reset(); 142 AnimationEnded(animation_.get()); 143 } 144 } 145} 146 147void DropdownBarHost::StopAnimation() { 148 animation_->End(); 149} 150 151bool DropdownBarHost::IsVisible() const { 152 return is_visible_; 153} 154 155//////////////////////////////////////////////////////////////////////////////// 156// DropdownBarHost, views::FocusChangeListener implementation: 157void DropdownBarHost::OnWillChangeFocus(views::View* focused_before, 158 views::View* focused_now) { 159 // First we need to determine if one or both of the views passed in are child 160 // views of our view. 161 bool our_view_before = focused_before && view_->Contains(focused_before); 162 bool our_view_now = focused_now && view_->Contains(focused_now); 163 164 // When both our_view_before and our_view_now are false, it means focus is 165 // changing hands elsewhere in the application (and we shouldn't do anything). 166 // Similarly, when both are true, focus is changing hands within the dropdown 167 // widget (and again, we should not do anything). We therefore only need to 168 // look at when we gain initial focus and when we loose it. 169 if (!our_view_before && our_view_now) { 170 // We are gaining focus from outside the dropdown widget so we must register 171 // a handler for Escape. 172 RegisterAccelerators(); 173 } else if (our_view_before && !our_view_now) { 174 // We are losing focus to something outside our widget so we restore the 175 // original handler for Escape. 176 UnregisterAccelerators(); 177 } 178} 179 180void DropdownBarHost::OnDidChangeFocus(views::View* focused_before, 181 views::View* focused_now) { 182} 183 184//////////////////////////////////////////////////////////////////////////////// 185// DropdownBarHost, ui::AnimationDelegate implementation: 186 187void DropdownBarHost::AnimationProgressed(const ui::Animation* animation) { 188 // First, we calculate how many pixels to slide the widget. 189 gfx::Size pref_size = view_->GetPreferredSize(); 190 animation_offset_ = static_cast<int>((1.0 - animation_->GetCurrentValue()) * 191 pref_size.height()); 192 193 // This call makes sure it appears in the right location, the size and shape 194 // is correct and that it slides in the right direction. 195 gfx::Rect dlg_rect = GetDialogPosition(gfx::Rect()); 196 SetDialogPosition(dlg_rect, false); 197 198 // Let the view know if we are animating, and at which offset to draw the 199 // edges. 200 delegate_->SetAnimationOffset(animation_offset_); 201 view_->SchedulePaint(); 202} 203 204void DropdownBarHost::AnimationEnded(const ui::Animation* animation) { 205 // Place the dropdown widget in its fully opened state. 206 animation_offset_ = 0; 207 208 if (!animation_->IsShowing()) { 209 // Animation has finished closing. 210 host_->Hide(); 211 is_visible_ = false; 212 } else { 213 // Animation has finished opening. 214 } 215} 216 217//////////////////////////////////////////////////////////////////////////////// 218// DropdownBarHost protected: 219 220void DropdownBarHost::ResetFocusTracker() { 221 focus_tracker_.reset(NULL); 222} 223 224void DropdownBarHost::GetWidgetBounds(gfx::Rect* bounds) { 225 DCHECK(bounds); 226 *bounds = browser_view_->bounds(); 227} 228 229void DropdownBarHost::UpdateWindowEdges(const gfx::Rect& new_pos) { 230 // |w| is used to make it easier to create the part of the polygon that curves 231 // the right side of the Find window. It essentially keeps track of the 232 // x-pixel position of the right-most background image inside the view. 233 // TODO(finnur): Let the view tell us how to draw the curves or convert 234 // this to a CustomFrameWindow. 235 int w = new_pos.width() - 6; // -6 positions us at the left edge of the 236 // rightmost background image of the view. 237 int h = new_pos.height(); 238 239 // This polygon array represents the outline of the background image for the 240 // window. Basically, it encompasses only the visible pixels of the 241 // concatenated find_dlg_LMR_bg images (where LMR = [left | middle | right]). 242 const Path::Point polygon[] = { 243 {2, 0}, {3, 1}, {3, h - 2}, {4, h - 1}, 244 {4, h}, {w+0, h}, 245 {w+2, h - 1}, {w+3, h - 2}, {w+3, 1}, {w+4, 0} 246 }; 247 248 // Find the largest x and y value in the polygon. 249 int max_x = 0, max_y = 0; 250 for (size_t i = 0; i < arraysize(polygon); i++) { 251 max_x = std::max(max_x, static_cast<int>(polygon[i].x)); 252 max_y = std::max(max_y, static_cast<int>(polygon[i].y)); 253 } 254 255 // We then create the polygon and use SetWindowRgn to force the window to draw 256 // only within that area. This region may get reduced in size below. 257 Path path(polygon, arraysize(polygon)); 258 ScopedPlatformRegion region(path.CreateNativeRegion()); 259 // Are we animating? 260 if (animation_offset() > 0) { 261 // The animation happens in two steps: First, we clip the window and then in 262 // GetWidgetPosition we offset the window position so that it still looks 263 // attached to the toolbar as it grows. We clip the window by creating a 264 // rectangle region (that gradually increases as the animation progresses) 265 // and find the intersection between the two regions using CombineRgn. 266 267 // |y| shrinks as the animation progresses from the height of the view down 268 // to 0 (and reverses when closing). 269 int y = animation_offset(); 270 // |y| shrinking means the animation (visible) region gets larger. In other 271 // words: the rectangle grows upward (when the widget is opening). 272 Path animation_path; 273 SkRect animation_rect = { SkIntToScalar(0), SkIntToScalar(y), 274 SkIntToScalar(max_x), SkIntToScalar(max_y) }; 275 animation_path.addRect(animation_rect); 276 ScopedPlatformRegion animation_region( 277 animation_path.CreateNativeRegion()); 278 region.Set(Path::IntersectRegions(animation_region.Get(), region.Get())); 279 280 // Next, we need to increase the region a little bit to account for the 281 // curved edges that the view will draw to make it look like grows out of 282 // the toolbar. 283 Path::Point left_curve[] = { 284 {2, y+0}, {3, y+1}, {3, y+0}, {2, y+0} 285 }; 286 Path::Point right_curve[] = { 287 {w+3, y+1}, {w+4, y+0}, {w+3, y+0}, {w+3, y+1} 288 }; 289 290 // Combine the region for the curve on the left with our main region. 291 Path left_path(left_curve, arraysize(left_curve)); 292 ScopedPlatformRegion r(left_path.CreateNativeRegion()); 293 region.Set(Path::CombineRegions(r.Get(), region.Get())); 294 295 // Combine the region for the curve on the right with our main region. 296 Path right_path(right_curve, arraysize(right_curve)); 297 region.Set(Path::CombineRegions(r.Get(), region.Get())); 298 } 299 300 // Now see if we need to truncate the region because parts of it obscures 301 // the main window border. 302 gfx::Rect widget_bounds; 303 GetWidgetBounds(&widget_bounds); 304 305 // Calculate how much our current position overlaps our boundaries. If we 306 // overlap, it means we have too little space to draw the whole widget and 307 // we allow overwriting the scrollbar before we start truncating our widget. 308 // 309 // TODO(brettw) this constant is evil. This is the amount of room we've added 310 // to the window size, when we set the region, it can change the size. 311 static const int kAddedWidth = 7; 312 int difference = new_pos.right() - kAddedWidth - widget_bounds.right() - 313 gfx::scrollbar_size() + 1; 314 if (difference > 0) { 315 Path::Point exclude[4]; 316 exclude[0].x = max_x - difference; // Top left corner. 317 exclude[0].y = 0; 318 319 exclude[1].x = max_x; // Top right corner. 320 exclude[1].y = 0; 321 322 exclude[2].x = max_x; // Bottom right corner. 323 exclude[2].y = max_y; 324 325 exclude[3].x = max_x - difference; // Bottom left corner. 326 exclude[3].y = max_y; 327 328 // Subtract this region from the original region. 329 gfx::Path exclude_path(exclude, arraysize(exclude)); 330 ScopedPlatformRegion exclude_region(exclude_path.CreateNativeRegion()); 331 region.Set(Path::SubtractRegion(region.Get(), exclude_region.Get())); 332 } 333 334 // Window takes ownership of the region. 335 host()->SetShape(region.release()); 336} 337 338void DropdownBarHost::RegisterAccelerators() { 339 DCHECK(!esc_accel_target_registered_); 340 ui::Accelerator escape(ui::VKEY_ESCAPE, ui::EF_NONE); 341 focus_manager_->RegisterAccelerator( 342 escape, ui::AcceleratorManager::kNormalPriority, this); 343 esc_accel_target_registered_ = true; 344} 345 346void DropdownBarHost::UnregisterAccelerators() { 347 DCHECK(esc_accel_target_registered_); 348 ui::Accelerator escape(ui::VKEY_ESCAPE, ui::EF_NONE); 349 focus_manager_->UnregisterAccelerator(escape, this); 350 esc_accel_target_registered_ = false; 351} 352