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// Copyright (c) 2010 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 "views/controls/single_split_view.h"
#if defined(OS_LINUX)
#include <gdk/gdk.h>
#endif
#include "gfx/canvas.h"
#include "skia/ext/skia_utils_win.h"
#include "views/background.h"
#if defined(OS_LINUX)
#include "gfx/gtk_util.h"
#endif
namespace views {
// Size of the divider in pixels.
static const int kDividerSize = 4;
SingleSplitView::SingleSplitView(View* leading,
View* trailing,
Orientation orientation)
: is_horizontal_(orientation == HORIZONTAL_SPLIT),
divider_offset_(-1),
resize_leading_on_bounds_change_(true) {
AddChildView(leading);
AddChildView(trailing);
#if defined(OS_WIN)
set_background(
views::Background::CreateSolidBackground(
skia::COLORREFToSkColor(GetSysColor(COLOR_3DFACE))));
#endif
}
void SingleSplitView::DidChangeBounds(const gfx::Rect& previous,
const gfx::Rect& current) {
if (resize_leading_on_bounds_change_) {
// We do not update divider_offset_ on minimize (to zero) and on restore
// (to largest value). As a result we get back to the original value upon
// window restore.
bool is_minimize_or_restore =
previous.height() == 0 || current.height() == 0;
if (!is_minimize_or_restore) {
if (is_horizontal_)
divider_offset_ += current.width() - previous.width();
else
divider_offset_ += current.height() - previous.height();
if (divider_offset_ < 0)
divider_offset_ = kDividerSize;
}
}
View::DidChangeBounds(previous, current);
}
void SingleSplitView::Layout() {
if (GetChildViewCount() != 2)
return;
View* leading = GetChildViewAt(0);
View* trailing = GetChildViewAt(1);
if (!leading->IsVisible() && !trailing->IsVisible())
return;
if (width() == 0 || height() == 0) {
// We are most likely minimized - do not touch divider offset.
return;
} else if (!trailing->IsVisible()) {
leading->SetBounds(0, 0, width(), height());
} else if (!leading->IsVisible()) {
trailing->SetBounds(0, 0, width(), height());
} else {
if (divider_offset_ < 0)
divider_offset_ = (GetPrimaryAxisSize() - kDividerSize) / 2;
else
divider_offset_ = std::min(divider_offset_,
GetPrimaryAxisSize() - kDividerSize);
if (is_horizontal_) {
leading->SetBounds(0, 0, divider_offset_, height());
trailing->SetBounds(divider_offset_ + kDividerSize, 0,
width() - divider_offset_ - kDividerSize, height());
} else {
leading->SetBounds(0, 0, width(), divider_offset_);
trailing->SetBounds(0, divider_offset_ + kDividerSize,
width(), height() - divider_offset_ - kDividerSize);
}
}
SchedulePaint();
// Invoke super's implementation so that the children are layed out.
View::Layout();
}
AccessibilityTypes::Role SingleSplitView::GetAccessibleRole() {
return AccessibilityTypes::ROLE_GROUPING;
}
gfx::Size SingleSplitView::GetPreferredSize() {
int width = 0;
int height = 0;
for (int i = 0; i < 2 && i < GetChildViewCount(); ++i) {
View* view = GetChildViewAt(i);
gfx::Size pref = view->GetPreferredSize();
if (is_horizontal_) {
width += pref.width();
height = std::max(height, pref.height());
} else {
width = std::max(width, pref.width());
height += pref.height();
}
}
if (is_horizontal_)
width += kDividerSize;
else
height += kDividerSize;
return gfx::Size(width, height);
}
gfx::NativeCursor SingleSplitView::GetCursorForPoint(
Event::EventType event_type,
const gfx::Point& p) {
if (IsPointInDivider(p)) {
#if defined(OS_WIN)
static HCURSOR we_resize_cursor = LoadCursor(NULL, IDC_SIZEWE);
static HCURSOR ns_resize_cursor = LoadCursor(NULL, IDC_SIZENS);
return is_horizontal_ ? we_resize_cursor : ns_resize_cursor;
#elif defined(OS_LINUX)
return gfx::GetCursor(is_horizontal_ ?
GDK_SB_H_DOUBLE_ARROW :
GDK_SB_V_DOUBLE_ARROW);
#endif
}
return NULL;
}
bool SingleSplitView::OnMousePressed(const MouseEvent& event) {
if (!IsPointInDivider(event.location()))
return false;
drag_info_.initial_mouse_offset = GetPrimaryAxisSize(event.x(), event.y());
drag_info_.initial_divider_offset = divider_offset_;
return true;
}
bool SingleSplitView::OnMouseDragged(const MouseEvent& event) {
if (GetChildViewCount() < 2)
return false;
int delta_offset = GetPrimaryAxisSize(event.x(), event.y()) -
drag_info_.initial_mouse_offset;
if (is_horizontal_ && base::i18n::IsRTL())
delta_offset *= -1;
// Honor the minimum size when resizing.
gfx::Size min = GetChildViewAt(0)->GetMinimumSize();
int new_size = std::max(GetPrimaryAxisSize(min.width(), min.height()),
drag_info_.initial_divider_offset + delta_offset);
// And don't let the view get bigger than our width.
new_size = std::min(GetPrimaryAxisSize() - kDividerSize, new_size);
if (new_size != divider_offset_) {
set_divider_offset(new_size);
Layout();
}
return true;
}
void SingleSplitView::OnMouseReleased(const MouseEvent& event, bool canceled) {
if (GetChildViewCount() < 2)
return;
if (canceled && drag_info_.initial_divider_offset != divider_offset_) {
set_divider_offset(drag_info_.initial_divider_offset);
Layout();
}
}
bool SingleSplitView::IsPointInDivider(const gfx::Point& p) {
if (GetChildViewCount() < 2)
return false;
if (!GetChildViewAt(0)->IsVisible() || !GetChildViewAt(1)->IsVisible())
return false;
int divider_relative_offset;
if (is_horizontal_) {
divider_relative_offset =
p.x() - GetChildViewAt(base::i18n::IsRTL() ? 1 : 0)->width();
} else {
divider_relative_offset = p.y() - GetChildViewAt(0)->height();
}
return (divider_relative_offset >= 0 &&
divider_relative_offset < kDividerSize);
}
} // namespace views
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