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// Copyright (c) 2012 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/ui/panels/panel_resize_controller.h"
#include "base/logging.h"
#include "chrome/browser/ui/panels/panel.h"
#include "chrome/browser/ui/panels/panel_manager.h"
namespace {
static bool ResizingLeft(panel::ResizingSides sides) {
return sides == panel::RESIZE_TOP_LEFT ||
sides == panel::RESIZE_LEFT ||
sides == panel::RESIZE_BOTTOM_LEFT;
}
static bool ResizingRight(panel::ResizingSides sides) {
return sides == panel::RESIZE_TOP_RIGHT ||
sides == panel::RESIZE_RIGHT ||
sides == panel::RESIZE_BOTTOM_RIGHT;
}
static bool ResizingTop(panel::ResizingSides sides) {
return sides == panel::RESIZE_TOP_LEFT ||
sides == panel::RESIZE_TOP ||
sides == panel::RESIZE_TOP_RIGHT;
}
static bool ResizingBottom(panel::ResizingSides sides) {
return sides == panel::RESIZE_BOTTOM_RIGHT ||
sides == panel::RESIZE_BOTTOM ||
sides == panel::RESIZE_BOTTOM_LEFT;
}
}
PanelResizeController::PanelResizeController(PanelManager* panel_manager)
: panel_manager_(panel_manager),
resizing_panel_(NULL),
sides_resized_(panel::RESIZE_NONE) {
}
void PanelResizeController::StartResizing(Panel* panel,
const gfx::Point& mouse_location,
panel::ResizingSides sides) {
DCHECK(!IsResizing());
DCHECK_NE(panel::RESIZE_NONE, sides);
panel::Resizability resizability = panel->CanResizeByMouse();
DCHECK_NE(panel::NOT_RESIZABLE, resizability);
if (panel::RESIZABLE_ALL_SIDES_EXCEPT_BOTTOM == resizability &&
ResizingBottom(sides)) {
DLOG(WARNING) << "Resizing from bottom not allowed. Is this a test?";
return;
}
mouse_location_at_start_ = mouse_location;
bounds_at_start_ = panel->GetBounds();
sides_resized_ = sides;
resizing_panel_ = panel;
resizing_panel_->OnPanelStartUserResizing();
}
void PanelResizeController::Resize(const gfx::Point& mouse_location) {
DCHECK(IsResizing());
panel::Resizability resizability = resizing_panel_->CanResizeByMouse();
if (panel::NOT_RESIZABLE == resizability) {
EndResizing(false);
return;
}
gfx::Rect bounds = resizing_panel_->GetBounds();
if (ResizingRight(sides_resized_)) {
bounds.set_width(std::max(bounds_at_start_.width() +
mouse_location.x() - mouse_location_at_start_.x(), 0));
}
if (ResizingBottom(sides_resized_)) {
DCHECK_EQ(panel::RESIZABLE_ALL_SIDES, resizability);
bounds.set_height(std::max(bounds_at_start_.height() +
mouse_location.y() - mouse_location_at_start_.y(), 0));
}
if (ResizingLeft(sides_resized_)) {
bounds.set_width(std::max(bounds_at_start_.width() +
mouse_location_at_start_.x() - mouse_location.x(), 0));
}
if (ResizingTop(sides_resized_)) {
int new_height = std::max(bounds_at_start_.height() +
mouse_location_at_start_.y() - mouse_location.y(), 0);
int new_y = bounds_at_start_.bottom() - new_height;
// If the mouse is within the main screen area, make sure that the top
// border of panel cannot go outside the work area. This is to prevent
// panel's titlebar from being resized under the taskbar or OSX menu bar
// that is aligned to top screen edge.
int display_area_top_position = panel_manager_->display_area().y();
if (panel_manager_->display_settings_provider()->
GetPrimaryScreenArea().Contains(mouse_location) &&
new_y < display_area_top_position) {
new_height -= display_area_top_position - new_y;
}
bounds.set_height(new_height);
}
resizing_panel_->IncreaseMaxSize(bounds.size());
// This effectively only clamps using the min size, since the max_size was
// updated above.
bounds.set_size(resizing_panel_->ClampSize(bounds.size()));
if (ResizingLeft(sides_resized_))
bounds.set_x(bounds_at_start_.right() - bounds.width());
if (ResizingTop(sides_resized_))
bounds.set_y(bounds_at_start_.bottom() - bounds.height());
if (bounds != resizing_panel_->GetBounds())
resizing_panel_->OnWindowResizedByMouse(bounds);
}
Panel* PanelResizeController::EndResizing(bool cancelled) {
DCHECK(IsResizing());
if (cancelled)
resizing_panel_->OnWindowResizedByMouse(bounds_at_start_);
// Do a thorough cleanup.
resizing_panel_->OnPanelEndUserResizing();
Panel* resized_panel = resizing_panel_;
resizing_panel_ = NULL;
sides_resized_ = panel::RESIZE_NONE;
bounds_at_start_ = gfx::Rect();
mouse_location_at_start_ = gfx::Point();
return resized_panel;
}
void PanelResizeController::OnPanelClosed(Panel* panel) {
if (!resizing_panel_)
return;
// If the resizing panel is closed, abort the resize operation.
if (resizing_panel_ == panel)
EndResizing(false);
}
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