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|
// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/tabs/dragged_tab_controller.h"
#include <math.h>
#include "chrome/browser/browser_window.h"
#include "chrome/browser/frame_util.h"
#include "chrome/browser/tab_contents.h"
#include "chrome/browser/tabs/dragged_tab_view.h"
#include "chrome/browser/tabs/hwnd_photobooth.h"
#include "chrome/browser/tabs/tab.h"
#include "chrome/browser/tabs/tab_strip.h"
#include "chrome/browser/web_contents.h"
#include "chrome/views/event.h"
#include "chrome/views/root_view.h"
#include "skia/include/SkBitmap.h"
static const int kHorizontalMoveThreshold = 16; // pixels
namespace {
///////////////////////////////////////////////////////////////////////////////
// WindowFinder
// A WindowForPoint facility that can ignore 2 provided window HWNDs.
//
class WindowFinder {
public:
static HWND WindowForPoint(const gfx::Point& screen_point, HWND ignore1) {
WindowFinder instance(screen_point, ignore1);
return instance.GetResult();
}
private:
WindowFinder(const gfx::Point& screen_point, HWND ignore1)
: screen_point_(screen_point.ToPOINT()),
ignore1_(ignore1),
result_(NULL) {
}
static BOOL CALLBACK WindowEnumProc(HWND hwnd, LPARAM lParam) {
WindowFinder* wf = reinterpret_cast<WindowFinder*>(lParam);
if (hwnd == wf->ignore1_)
return true;
if (::IsWindowVisible(hwnd)) {
CRect r;
::GetWindowRect(hwnd, &r);
if (r.PtInRect(wf->screen_point_)) {
// We always deal with the root HWND.
wf->result_ = GetAncestor(hwnd, GA_ROOT);
return FALSE;
}
}
return TRUE;
}
HWND GetResult() {
EnumThreadWindows(GetCurrentThreadId(), WindowEnumProc,
reinterpret_cast<LPARAM>(this));
return result_;
}
POINT screen_point_;
HWND ignore1_;
HWND result_;
DISALLOW_EVIL_CONSTRUCTORS(WindowFinder);
};
gfx::Point ConvertScreenPointToTabStripPoint(TabStrip* tabstrip,
const gfx::Point& screen_point) {
CPoint tabstrip_topleft(0, 0);
ChromeViews::View::ConvertPointToScreen(tabstrip, &tabstrip_topleft);
return gfx::Point(screen_point.x() - tabstrip_topleft.x,
screen_point.y() - tabstrip_topleft.y);
}
}
///////////////////////////////////////////////////////////////////////////////
// DraggedTabController, public:
DraggedTabController::DraggedTabController(Tab* source_tab,
TabStrip* source_tabstrip)
: dragged_contents_(NULL),
original_delegate_(NULL),
source_tab_(source_tab),
source_tabstrip_(source_tabstrip),
source_model_index_(source_tabstrip->GetIndexOfTab(source_tab)),
attached_tabstrip_(source_tabstrip),
old_focused_view_(NULL),
in_destructor_(false),
last_move_screen_x_(0) {
ChangeDraggedContents(
source_tabstrip_->model()->GetTabContentsAt(source_model_index_));
// Listen for Esc key presses.
MessageLoop::current()->AddObserver(this);
}
DraggedTabController::~DraggedTabController() {
in_destructor_ = true;
CleanUpSourceTab();
MessageLoop::current()->RemoveObserver(this);
ChangeDraggedContents(NULL); // This removes our observer.
}
void DraggedTabController::CaptureDragInfo(const gfx::Point& mouse_offset) {
start_screen_point_ = GetCursorScreenPoint();
mouse_offset_ = mouse_offset;
}
void DraggedTabController::Drag() {
// Before we get to dragging anywhere, ensure that we consider ourselves
// attached to the source tabstrip.
if (source_tab_->IsVisible() && CanStartDrag())
Attach(source_tabstrip_, gfx::Point());
if (!source_tab_->IsVisible()) {
SaveFocus();
ContinueDragging();
}
}
void DraggedTabController::EndDrag(bool canceled) {
EndDragImpl(canceled ? CANCELED : NORMAL);
}
Tab* DraggedTabController::GetDragSourceTabForContents(
TabContents* contents) const {
if (attached_tabstrip_ == source_tabstrip_)
return contents == dragged_contents_ ? source_tab_ : NULL;
return NULL;
}
bool DraggedTabController::IsDragSourceTab(Tab* tab) const {
return source_tab_ == tab;
}
///////////////////////////////////////////////////////////////////////////////
// DraggedTabController, PageNavigator implementation:
void DraggedTabController::OpenURLFromTab(
TabContents* source,
const GURL& url,
WindowOpenDisposition disposition,
PageTransition::Type transition,
const std::string& override_encoding) {
if (original_delegate_) {
if (disposition == CURRENT_TAB)
disposition = NEW_WINDOW;
original_delegate_->OpenURLFromTab(source, url, disposition, transition,
override_encoding);
}
}
///////////////////////////////////////////////////////////////////////////////
// DraggedTabController, TabContentsDelegate implementation:
void DraggedTabController::NavigationStateChanged(const TabContents* source,
unsigned changed_flags) {
if (view_.get())
view_->Update();
}
void DraggedTabController::ReplaceContents(TabContents* source,
TabContents* new_contents) {
DCHECK(dragged_contents_ == source);
source->set_delegate(NULL);
new_contents->set_delegate(this);
// If we're attached to a TabStrip, we need to tell the TabStrip that this
// TabContents was replaced.
if (attached_tabstrip_ && attached_tabstrip_->model() && dragged_contents_) {
int index =
attached_tabstrip_->model()->GetIndexOfTabContents(dragged_contents_);
if (index != TabStripModel::kNoTab)
attached_tabstrip_->model()->ReplaceTabContentsAt(index, new_contents);
}
// Update our internal state.
ChangeDraggedContents(new_contents);
if (view_.get())
view_->Update();
}
void DraggedTabController::AddNewContents(TabContents* source,
TabContents* new_contents,
WindowOpenDisposition disposition,
const gfx::Rect& initial_pos,
bool user_gesture) {
// Theoretically could be called while dragging if the page tries to
// spawn a window. Route this message back to the browser in most cases.
if (disposition == CURRENT_TAB) {
ReplaceContents(source, new_contents);
} else if (original_delegate_) {
original_delegate_->AddNewContents(source, new_contents, disposition,
initial_pos, user_gesture);
}
}
void DraggedTabController::ActivateContents(TabContents* contents) {
// Ignored.
}
void DraggedTabController::LoadingStateChanged(TabContents* source) {
// It would be nice to respond to this message by changing the
// screen shot in the dragged tab.
if (view_.get())
view_->Update();
}
void DraggedTabController::CloseContents(TabContents* source) {
// Theoretically could be called by a window. Should be ignored
// because window.close() is ignored (usually, even though this
// method gets called.)
}
void DraggedTabController::MoveContents(TabContents* source,
const gfx::Rect& pos) {
// Theoretically could be called by a web page trying to move its
// own window. Should be ignored since we're moving the window...
}
bool DraggedTabController::IsPopup(TabContents* source) {
return false;
}
void DraggedTabController::ToolbarSizeChanged(TabContents* source,
bool finished) {
// Dragged tabs don't care about this.
}
void DraggedTabController::URLStarredChanged(TabContents* source,
bool starred) {
// Ignored.
}
void DraggedTabController::UpdateTargetURL(TabContents* source,
const GURL& url) {
// Ignored.
}
///////////////////////////////////////////////////////////////////////////////
// DraggedTabController, NotificationObserver implementation:
void DraggedTabController::Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details) {
DCHECK(type == NOTIFY_TAB_CONTENTS_DESTROYED);
DCHECK(Source<TabContents>(source).ptr() == dragged_contents_);
EndDragImpl(TAB_DESTROYED);
}
///////////////////////////////////////////////////////////////////////////////
// DraggedTabController, MessageLoop::Observer implementation:
void DraggedTabController::WillProcessMessage(const MSG& msg) {
}
void DraggedTabController::DidProcessMessage(const MSG& msg) {
// If the user presses ESC during a drag, we need to abort and revert things
// to the way they were. This is the most reliable way to do this since no
// single view or window reliably receives events throughout all the various
// kinds of tab dragging.
if (msg.message == WM_KEYDOWN && msg.wParam == VK_ESCAPE)
EndDrag(true);
}
///////////////////////////////////////////////////////////////////////////////
// DraggedTabController, private:
void DraggedTabController::InitWindowCreatePoint() {
CPoint mouse_offset_cpoint(mouse_offset_.x(), mouse_offset_.y());
Tab* first_tab = attached_tabstrip_->GetTabAt(0);
ChromeViews::View::ConvertPointToViewContainer(first_tab,
&mouse_offset_cpoint);
window_create_point_.SetPoint(mouse_offset_cpoint.x, mouse_offset_cpoint.y);
}
gfx::Point DraggedTabController::GetWindowCreatePoint() const {
POINT pt;
GetCursorPos(&pt);
return gfx::Point(pt.x - window_create_point_.x(),
pt.y - window_create_point_.y());
}
void DraggedTabController::ChangeDraggedContents(TabContents* new_contents) {
if (dragged_contents_) {
NotificationService::current()->RemoveObserver(this,
NOTIFY_TAB_CONTENTS_DESTROYED,
Source<TabContents>(dragged_contents_));
}
dragged_contents_ = new_contents;
if (dragged_contents_) {
NotificationService::current()->AddObserver(this,
NOTIFY_TAB_CONTENTS_DESTROYED,
Source<TabContents>(dragged_contents_));
}
}
void DraggedTabController::SaveFocus() {
if (!old_focused_view_) {
old_focused_view_ = source_tab_->GetRootView()->GetFocusedView();
source_tab_->GetRootView()->FocusView(source_tab_);
}
}
void DraggedTabController::RestoreFocus() {
if (old_focused_view_ && attached_tabstrip_ == source_tabstrip_)
old_focused_view_->GetRootView()->FocusView(old_focused_view_);
old_focused_view_ = NULL;
}
bool DraggedTabController::CanStartDrag() const {
// Determine if the mouse has moved beyond a minimum elasticity distance in
// any direction from the starting point.
static const int kMinimumDragDistance = 10;
gfx::Point screen_point = GetCursorScreenPoint();
int x_offset = abs(screen_point.x() - start_screen_point_.x());
int y_offset = abs(screen_point.y() - start_screen_point_.y());
return sqrt(pow(static_cast<float>(x_offset), 2) +
pow(static_cast<float>(y_offset), 2)) > kMinimumDragDistance;
}
void DraggedTabController::ContinueDragging() {
EnsureDraggedView();
// Note that the coordinates given to us by |drag_event| are basically
// useless, since they're in source_tab_ coordinates. On the surface, you'd
// think we could just convert them to screen coordinates, however in the
// situation where we're dragging the last tab in a window when multiple
// windows are open, the coordinates of |source_tab_| are way off in
// hyperspace since the window was moved there instead of being closed so
// that we'd keep receiving events. And our ConvertPointToScreen methods
// aren't really multi-screen aware. So really it's just safer to get the
// actual position of the mouse cursor directly from Windows here, which is
// guaranteed to be correct regardless of monitor config.
gfx::Point screen_point = GetCursorScreenPoint();
// Determine whether or not we have dragged over a compatible TabStrip in
// another browser window. If we have, we should attach to it and start
// dragging within it.
TabStrip* target_tabstrip = GetTabStripForPoint(screen_point);
if (target_tabstrip != attached_tabstrip_) {
if (target_tabstrip) {
// We may receive this event before we're fully detached from the source,
// we check for that and force a detach now.
if (attached_tabstrip_)
Detach();
Attach(target_tabstrip, screen_point);
} else {
Detach();
}
}
MoveTab(screen_point);
}
void DraggedTabController::MoveTab(const gfx::Point& screen_point) {
gfx::Point dragged_view_point = GetDraggedViewPoint(screen_point);
if (attached_tabstrip_) {
// Determine the horizontal move threshold. This is dependent on the width
// of tabs. The smaller the tabs compared to the standard size, the smaller
// the threshold.
double unselected, selected;
attached_tabstrip_->GetCurrentTabWidths(&unselected, &selected);
double ratio = unselected / Tab::GetStandardSize().width();
int threshold = static_cast<int>(ratio * kHorizontalMoveThreshold);
// Update the model, moving the TabContents from one index to another. Do
// this only if we have moved a minimum distance since the last reorder (to
// prevent jitter).
if (abs(screen_point.x() - last_move_screen_x_) > threshold) {
TabStripModel* attached_model = attached_tabstrip_->model();
int from_index =
attached_model->GetIndexOfTabContents(dragged_contents_);
gfx::Rect bounds = GetDraggedViewTabStripBounds(dragged_view_point);
int to_index = GetInsertionIndexForDraggedBounds(bounds);
to_index = NormalizeIndexToAttachedTabStrip(to_index);
if (from_index != to_index) {
last_move_screen_x_ = screen_point.x();
attached_model->MoveTabContentsAt(from_index, to_index);
}
}
}
// Move the View. There are no changes to the model if we're detached.
view_->MoveTo(dragged_view_point);
}
TabStrip* DraggedTabController::GetTabStripForPoint(
const gfx::Point& screen_point) const {
HWND dragged_hwnd = view_->GetViewContainer()->GetHWND();
HWND other_hwnd = WindowFinder::WindowForPoint(screen_point, dragged_hwnd);
if (!other_hwnd)
return NULL;
BrowserWindow* other_frame = FrameUtil::GetBrowserWindowForHWND(other_hwnd);
if (other_frame) {
TabStrip* other_tabstrip = other_frame->GetTabStrip();
if (!other_tabstrip->IsCompatibleWith(source_tabstrip_))
return NULL;
return GetTabStripIfItContains(other_tabstrip, screen_point);
}
return NULL;
}
TabStrip* DraggedTabController::GetTabStripIfItContains(
TabStrip* tabstrip, const gfx::Point& screen_point) const {
static const int kVerticalDetachMagnetism = 15;
// Make sure the specified screen point is actually within the bounds of the
// specified tabstrip...
gfx::Rect tabstrip_bounds = GetViewScreenBounds(tabstrip);
if (screen_point.x() < tabstrip_bounds.right() &&
screen_point.x() >= tabstrip_bounds.x()) {
// TODO(beng): make this be relative to the start position of the mouse for
// the source TabStrip.
int upper_threshold = tabstrip_bounds.bottom() + kVerticalDetachMagnetism;
int lower_threshold = tabstrip_bounds.y() - kVerticalDetachMagnetism;
if (screen_point.y() >= lower_threshold &&
screen_point.y() <= upper_threshold) {
return tabstrip;
}
}
return NULL;
}
void DraggedTabController::Attach(TabStrip* attached_tabstrip,
const gfx::Point& screen_point) {
attached_tabstrip_ = attached_tabstrip;
InitWindowCreatePoint();
attached_tabstrip_->GenerateIdealBounds();
// We don't need the photo-booth while we're attached.
photobooth_.reset(NULL);
Tab* tab = GetTabMatchingDraggedContents(attached_tabstrip_);
// Update the View first, so we can ask it for its bounds and determine
// where to insert the hidden Tab.
// If this is the first time Attach is called for this drag, we're attaching
// to the source TabStrip, and we should assume the tab count already
// includes this Tab since we haven't been detached yet. If we don't do this,
// the dragged representation will be a different size to others in the
// TabStrip.
int tab_count = attached_tabstrip_->GetTabCount();
if (!tab)
++tab_count;
double unselected_width, selected_width = 0;
attached_tabstrip_->GetDesiredTabWidths(tab_count, &unselected_width,
&selected_width);
EnsureDraggedView();
view_->Attach(static_cast<int>(selected_width));
if (!tab) {
// There is no Tab in |attached_tabstrip| that corresponds to the dragged
// TabContents. We must now create one.
// Remove ourselves as the delegate now that the dragged TabContents is
// being inserted back into a Browser.
dragged_contents_->set_delegate(NULL);
original_delegate_ = NULL;
// Return the TabContents' to normalcy.
dragged_contents_->DidCaptureContents();
// We need to ask the TabStrip we're attached to to ensure that the ideal
// bounds for all its tabs are correctly generated, because the calculation
// in GetInsertionIndexForDraggedBounds needs them to be to figure out the
// appropriate insertion index.
attached_tabstrip_->GenerateIdealBounds();
// Inserting counts as a move. We don't want the tabs to jitter when the
// user moves the tab immediately after attaching it.
last_move_screen_x_ = screen_point.x();
// Figure out where to insert the tab based on the bounds of the dragged
// representation and the ideal bounds of the other Tabs already in the
// strip. ("ideal bounds" are stable even if the Tabs' actual bounds are
// changing due to animation).
gfx::Rect bounds = GetDraggedViewTabStripBounds(screen_point);
int index = GetInsertionIndexForDraggedBounds(bounds);
index = std::max(std::min(index, attached_tabstrip_->model()->count()), 0);
attached_tabstrip_->model()->InsertTabContentsAt(index, dragged_contents_,
true, false);
tab = GetTabMatchingDraggedContents(attached_tabstrip_);
}
DCHECK(tab); // We should now have a tab.
tab->SetVisible(false);
// Move the corresponding window to the front.
attached_tabstrip_->GetViewContainer()->MoveToFront(true);
}
void DraggedTabController::Detach() {
// Prevent the TabContents' HWND from being hidden by any of the model
// operations performed during the drag.
dragged_contents_->WillCaptureContents();
// Update the Model.
TabStripModel* attached_model = attached_tabstrip_->model();
int index = attached_model->GetIndexOfTabContents(dragged_contents_);
if (index >= 0 && index < attached_model->count()) {
attached_model->DetachTabContentsAt(index);
attached_tabstrip_->SchedulePaint();
}
// If we've removed the last Tab from the TabStrip, hide the frame now.
if (attached_model->empty())
HideFrame();
// Set up the photo booth to start capturing the contents of the dragged
// TabContents.
if (!photobooth_.get())
photobooth_.reset(new HWNDPhotobooth(dragged_contents_->GetContainerHWND()));
// Update the View.
view_->Detach(photobooth_.get());
// We need to be the delegate so we receive messages about stuff,
// otherwise our dragged_contents() may be replaced and subsequently
// collected/destroyed while the drag is in process, leading to
// nasty crashes.
original_delegate_ = dragged_contents_->delegate();
dragged_contents_->set_delegate(this);
attached_tabstrip_ = NULL;
}
int DraggedTabController::GetInsertionIndexForDraggedBounds(
const gfx::Rect& dragged_bounds) const {
int right_tab_x = 0;
// If the UI layout of the tab strip is right-to-left, we need to mirror the
// bounds of the dragged tab before performing the drag/drop related
// calculations. We mirror the dragged bounds because we determine the
// position of each tab on the tab strip by calling GetBounds() (without the
// mirroring transformation flag) which effectively means that even though
// the tabs are rendered from right to left, the code performs the
// calculation as if the tabs are laid out from left to right. Mirroring the
// dragged bounds adjusts the coordinates of the tab we are dragging so that
// it uses the same orientation used by the tabs on the tab strip.
gfx::Rect adjusted_bounds(dragged_bounds);
adjusted_bounds.set_x(
attached_tabstrip_->MirroredLeftPointForRect(adjusted_bounds));
for (int i = 0; i < attached_tabstrip_->GetTabCount(); ++i) {
gfx::Rect ideal_bounds = attached_tabstrip_->GetIdealBounds(i);
gfx::Rect left_half = ideal_bounds;
left_half.set_width(left_half.width() / 2);
gfx::Rect right_half = ideal_bounds;
right_half.set_width(ideal_bounds.width() - left_half.width());
right_half.set_x(left_half.right());
right_tab_x = right_half.right();
if (adjusted_bounds.x() >= right_half.x() &&
adjusted_bounds.x() < right_half.right()) {
return i + 1;
} else if (adjusted_bounds.x() >= left_half.x() &&
adjusted_bounds.x() < left_half.right()) {
return i;
}
}
if (adjusted_bounds.right() > right_tab_x)
return attached_tabstrip_->model()->count();
return TabStripModel::kNoTab;
}
gfx::Rect DraggedTabController::GetDraggedViewTabStripBounds(
const gfx::Point& screen_point) {
gfx::Point client_point =
ConvertScreenPointToTabStripPoint(attached_tabstrip_, screen_point);
gfx::Size view_size = view_->attached_tab_size();
return gfx::Rect(client_point.x(), client_point.y(),
view_size.width(), view_size.height());
}
gfx::Point DraggedTabController::GetDraggedViewPoint(
const gfx::Point& screen_point) {
int x = screen_point.x() - mouse_offset_.x();
int y = screen_point.y() - mouse_offset_.y();
// If we're not attached, we just use x and y from above.
if (attached_tabstrip_) {
gfx::Rect tabstrip_bounds = GetViewScreenBounds(attached_tabstrip_);
// Snap the dragged Tab to the TabStrip if we are attached, detaching
// only when the mouse position (screen_point) exceeds the screen bounds
// of the TabStrip.
if (x < tabstrip_bounds.x() && screen_point.x() >= tabstrip_bounds.x())
x = tabstrip_bounds.x();
gfx::Size tab_size = view_->attached_tab_size();
int vertical_drag_magnetism = tab_size.height() * 2;
int vertical_detach_point = tabstrip_bounds.y() - vertical_drag_magnetism;
if (y < tabstrip_bounds.y() && screen_point.y() >= vertical_detach_point)
y = tabstrip_bounds.y();
// Make sure the Tab can't be dragged off the right side of the TabStrip
// unless the mouse pointer passes outside the bounds of the strip by
// clamping the position of the dragged window to the tabstrip width less
// the width of one tab until the mouse pointer (screen_point) exceeds the
// screen bounds of the TabStrip.
int max_x = tabstrip_bounds.right() - tab_size.width();
int max_y = tabstrip_bounds.bottom() - tab_size.height();
if (x > max_x && screen_point.x() <= tabstrip_bounds.right())
x = max_x;
if (y > max_y && screen_point.y() <=
(tabstrip_bounds.bottom() + vertical_drag_magnetism)) {
y = max_y;
}
}
return gfx::Point(x, y);
}
Tab* DraggedTabController::GetTabMatchingDraggedContents(
TabStrip* tabstrip) const {
int index = tabstrip->model()->GetIndexOfTabContents(dragged_contents_);
return index == TabStripModel::kNoTab ? NULL : tabstrip->GetTabAt(index);
}
void DraggedTabController::EndDragImpl(EndDragType type) {
bool destroy_now = true;
if (type != TAB_DESTROYED) {
// We only finish up the drag if we were actually dragging. If we never
// constructed a view, the user just clicked and released and didn't move the
// mouse enough to trigger a drag.
if (view_.get()) {
RestoreFocus();
if (type == CANCELED) {
RevertDrag();
} else {
destroy_now = CompleteDrag();
}
}
} else {
// If we get here it means the NavigationController is going down. Don't
// attempt to do any cleanup other than resetting the delegate (if we're
// still the delegate).
if (dragged_contents_ && dragged_contents_->delegate() == this)
dragged_contents_->set_delegate(NULL);
dragged_contents_ = NULL;
attached_tabstrip_ = NULL;
}
// If we're not destroyed now, we'll be destroyed asynchronously later.
if (destroy_now)
source_tabstrip_->DestroyDragController();
}
void DraggedTabController::RevertDrag() {
// We save this here because code below will modify |attached_tabstrip_|.
bool restore_frame = attached_tabstrip_ != source_tabstrip_;
if (attached_tabstrip_) {
int index = attached_tabstrip_->model()->GetIndexOfTabContents(
dragged_contents_);
if (attached_tabstrip_ != source_tabstrip_) {
// The Tab was inserted into another TabStrip. We need to put it back
// into the original one.
attached_tabstrip_->model()->DetachTabContentsAt(index);
// TODO(beng): (Cleanup) seems like we should use Attach() for this
// somehow.
attached_tabstrip_ = source_tabstrip_;
source_tabstrip_->model()->InsertTabContentsAt(source_model_index_,
dragged_contents_, true, false);
} else {
// The Tab was moved within the TabStrip where the drag was initiated.
// Move it back to the starting location.
source_tabstrip_->model()->MoveTabContentsAt(index, source_model_index_);
}
} else {
// TODO(beng): (Cleanup) seems like we should use Attach() for this
// somehow.
attached_tabstrip_ = source_tabstrip_;
// The Tab was detached from the TabStrip where the drag began, and has not
// been attached to any other TabStrip. We need to put it back into the
// source TabStrip.
source_tabstrip_->model()->InsertTabContentsAt(source_model_index_,
dragged_contents_, true, false);
}
// If we're not attached to any TabStrip, or attached to some other TabStrip,
// we need to restore the bounds of the original TabStrip's frame, in case
// it has been hidden.
if (restore_frame) {
if (!restore_bounds_.IsEmpty()) {
HWND frame_hwnd = source_tabstrip_->GetViewContainer()->GetHWND();
MoveWindow(frame_hwnd, restore_bounds_.x(), restore_bounds_.y(),
restore_bounds_.width(), restore_bounds_.height(), TRUE);
}
}
source_tab_->SetVisible(true);
}
bool DraggedTabController::CompleteDrag() {
bool destroy_immediately = true;
if (attached_tabstrip_) {
// We don't need to do anything other than make the Tab visible again,
// since the dragged View is going away.
Tab* tab = GetTabMatchingDraggedContents(attached_tabstrip_);
view_->AnimateToBounds(
GetViewScreenBounds(tab),
NewCallback(this, &DraggedTabController::OnAnimateToBoundsComplete));
destroy_immediately = false;
} else {
// Compel the model to construct a new window for the detached TabContents.
source_tabstrip_->model()->TearOffTabContents(
dragged_contents_,
GetWindowCreatePoint());
CleanUpHiddenFrame();
}
return destroy_immediately;
}
void DraggedTabController::EnsureDraggedView() {
if (!view_.get()) {
RECT wr;
GetWindowRect(dragged_contents_->GetContainerHWND(), &wr);
view_.reset(new DraggedTabView(dragged_contents_, mouse_offset_,
gfx::Size(wr.right - wr.left, wr.bottom - wr.top)));
}
}
gfx::Point DraggedTabController::GetCursorScreenPoint() const {
POINT pt;
GetCursorPos(&pt);
return gfx::Point(pt);
}
gfx::Rect DraggedTabController::GetViewScreenBounds(
ChromeViews::View* view) const {
CPoint view_topleft(0, 0);
ChromeViews::View::ConvertPointToScreen(view, &view_topleft);
CRect view_screen_bounds;
view->GetLocalBounds(&view_screen_bounds, true);
view_screen_bounds.OffsetRect(view_topleft);
return gfx::Rect(view_screen_bounds);
}
int DraggedTabController::NormalizeIndexToAttachedTabStrip(int index) const {
DCHECK(attached_tabstrip_) << "Can only be called when attached!";
TabStripModel* attached_model = attached_tabstrip_->model();
if (index >= attached_model->count())
return attached_model->count() - 1;
if (index == TabStripModel::kNoTab)
return 0;
return index;
}
void DraggedTabController::HideFrame() {
// We don't actually hide the window, rather we just move it way off-screen.
// If we actually hide it, we stop receiving drag events.
HWND frame_hwnd = source_tabstrip_->GetViewContainer()->GetHWND();
RECT wr;
GetWindowRect(frame_hwnd, &wr);
MoveWindow(frame_hwnd, 0xFFFF, 0xFFFF, wr.right - wr.left,
wr.bottom - wr.top, TRUE);
// We also save the bounds of the window prior to it being moved, so that if
// the drag session is aborted we can restore them.
restore_bounds_ = gfx::Rect(wr);
}
void DraggedTabController::CleanUpHiddenFrame() {
// If the model we started dragging from is now empty, we must ask the
// delegate to close the frame.
if (source_tabstrip_->model()->empty())
source_tabstrip_->model()->delegate()->CloseFrameAfterDragSession();
}
void DraggedTabController::CleanUpSourceTab() {
// If we were attached to the source TabStrip, source Tab will be in use
// as the Tab. If we were detached or attached to another TabStrip, we can
// safely remove this item and delete it now.
if (attached_tabstrip_ != source_tabstrip_) {
source_tabstrip_->DestroyDraggedSourceTab(source_tab_);
source_tab_ = NULL;
}
}
void DraggedTabController::OnAnimateToBoundsComplete() {
// Sometimes, for some reason, in automation we can be called back on a
// detach even though we aren't attached to a TabStrip. Guard against that.
if (attached_tabstrip_) {
Tab* tab = GetTabMatchingDraggedContents(attached_tabstrip_);
if (tab)
tab->SetVisible(true);
}
CleanUpHiddenFrame();
if (!in_destructor_)
source_tabstrip_->DestroyDragController();
}
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