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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"
#include "ui/base/hit_test.h"
namespace {
bool ResizingLeft(int component) {
return component == HTTOPLEFT ||
component == HTLEFT ||
component == HTBOTTOMLEFT;
}
bool ResizingRight(int component) {
return component == HTTOPRIGHT ||
component == HTRIGHT ||
component == HTBOTTOMRIGHT;
}
bool ResizingTop(int component) {
return component == HTTOPLEFT ||
component == HTTOP ||
component == HTTOPRIGHT;
}
bool ResizingBottom(int component) {
return component == HTBOTTOMRIGHT ||
component == HTBOTTOM ||
component == HTBOTTOMLEFT;
}
} // namespace
PanelResizeController::PanelResizeController(PanelManager* panel_manager)
: panel_manager_(panel_manager),
resizing_panel_(NULL),
component_(HTNOWHERE) {
}
void PanelResizeController::StartResizing(Panel* panel,
const gfx::Point& mouse_location,
int component) {
DCHECK(!IsResizing());
DCHECK_NE(HTNOWHERE, component);
panel::Resizability resizability = panel->CanResizeByMouse();
DCHECK_NE(panel::NOT_RESIZABLE, resizability);
panel::Resizability resizability_to_test;
switch (component) {
case HTTOPLEFT:
resizability_to_test = panel::RESIZABLE_TOP_LEFT;
break;
case HTTOP:
resizability_to_test = panel::RESIZABLE_TOP;
break;
case HTTOPRIGHT:
resizability_to_test = panel::RESIZABLE_TOP_RIGHT;
break;
case HTLEFT:
resizability_to_test = panel::RESIZABLE_LEFT;
break;
case HTRIGHT:
resizability_to_test = panel::RESIZABLE_RIGHT;
break;
case HTBOTTOMLEFT:
resizability_to_test = panel::RESIZABLE_BOTTOM_LEFT;
break;
case HTBOTTOM:
resizability_to_test = panel::RESIZABLE_BOTTOM;
break;
case HTBOTTOMRIGHT:
resizability_to_test = panel::RESIZABLE_BOTTOM_RIGHT;
break;
default:
resizability_to_test = panel::NOT_RESIZABLE;
break;
}
if ((resizability & resizability_to_test) == 0) {
DLOG(WARNING) << "Resizing not allowed. Is this a test?";
return;
}
mouse_location_at_start_ = mouse_location;
bounds_at_start_ = panel->GetBounds();
component_ = component;
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(component_)) {
bounds.set_width(std::max(bounds_at_start_.width() +
mouse_location.x() - mouse_location_at_start_.x(), 0));
}
if (ResizingBottom(component_)) {
bounds.set_height(std::max(bounds_at_start_.height() +
mouse_location.y() - mouse_location_at_start_.y(), 0));
}
if (ResizingLeft(component_)) {
bounds.set_width(std::max(bounds_at_start_.width() +
mouse_location_at_start_.x() - mouse_location.x(), 0));
}
if (ResizingTop(component_)) {
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;
// Make sure that the panel's titlebar cannot be resized under the taskbar
// or OSX menu bar that is aligned to top screen edge.
gfx::Rect display_area = panel_manager_->display_settings_provider()->
GetDisplayAreaMatching(bounds);
gfx::Rect work_area = panel_manager_->display_settings_provider()->
GetWorkAreaMatching(bounds);
if (display_area.y() <= mouse_location.y() &&
mouse_location.y() < work_area.y()) {
new_height -= work_area.y() - 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(component_))
bounds.set_x(bounds_at_start_.right() - bounds.width());
if (ResizingTop(component_))
bounds.set_y(bounds_at_start_.bottom() - bounds.height());
if (bounds != resizing_panel_->GetBounds()) {
resizing_panel_->SetPanelBoundsInstantly(bounds);
resizing_panel_->OnWindowResizedByMouse(bounds);
}
}
Panel* PanelResizeController::EndResizing(bool cancelled) {
DCHECK(IsResizing());
if (cancelled) {
resizing_panel_->SetPanelBoundsInstantly(bounds_at_start_);
resizing_panel_->OnWindowResizedByMouse(bounds_at_start_);
}
// Do a thorough cleanup.
resizing_panel_->OnPanelEndUserResizing();
Panel* resized_panel = resizing_panel_;
resizing_panel_ = NULL;
component_ = HTNOWHERE;
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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