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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 "ui/views/controls/combobox/native_combobox_win.h"
#include "base/i18n/rtl.h"
#include "base/strings/utf_string_conversions.h"
#include "ui/base/events/event.h"
#include "ui/base/models/combobox_model.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/base/win/hwnd_util.h"
#include "ui/gfx/font.h"
#include "ui/native_theme/native_theme_win.h"
#include "ui/views/controls/combobox/combobox.h"
#include "ui/views/controls/combobox/native_combobox_views.h"
#include "ui/views/widget/widget.h"
namespace {
// Limit how small a combobox can be.
const int kMinComboboxWidth = 148;
// Add a couple extra pixels to the widths of comboboxes and combobox
// dropdowns so that text isn't too crowded.
const int kComboboxExtraPaddingX = 6;
} // namespace
namespace views {
////////////////////////////////////////////////////////////////////////////////
// NativeComboboxWin, public:
NativeComboboxWin::NativeComboboxWin(Combobox* combobox)
: combobox_(combobox),
content_width_(0) {
// Associates the actual HWND with the combobox so it is the one considered as
// having the focus (not the wrapper) when the HWND is focused directly (with
// a click for example).
set_focus_view(combobox);
}
NativeComboboxWin::~NativeComboboxWin() {
}
////////////////////////////////////////////////////////////////////////////////
// NativeComboboxWin, NativeComboboxWrapper implementation:
void NativeComboboxWin::UpdateFromModel() {
SendMessage(native_view(), CB_RESETCONTENT, 0, 0);
const gfx::Font& font = Combobox::GetFont();
int max_width = 0;
int num_items = combobox_->model()->GetItemCount();
for (int i = 0; i < num_items; ++i) {
string16 text = combobox_->model()->GetItemAt(i);
// Inserting the Unicode formatting characters if necessary so that the
// text is displayed correctly in right-to-left UIs.
base::i18n::AdjustStringForLocaleDirection(&text);
SendMessage(native_view(), CB_ADDSTRING, 0,
reinterpret_cast<LPARAM>(UTF16ToWide(text).c_str()));
max_width = std::max(max_width, font.GetStringWidth(text));
}
content_width_ = max_width;
if (num_items > 0) {
SendMessage(native_view(), CB_SETCURSEL, combobox_->selected_index(), 0);
// Set the width for the drop down while accounting for the scrollbar and
// borders.
if (num_items > ComboBox_GetMinVisible(native_view()))
max_width += GetSystemMetrics(SM_CXVSCROLL);
// SM_CXEDGE would not be correct here, since the dropdown is flat, not 3D.
int kComboboxDropdownBorderSize = 1;
max_width += 2 * kComboboxDropdownBorderSize + kComboboxExtraPaddingX;
SendMessage(native_view(), CB_SETDROPPEDWIDTH, max_width, 0);
}
}
void NativeComboboxWin::UpdateSelectedIndex() {
// Note that we use CB_SETCURSEL and not CB_SELECTSTRING because on RTL
// locales the strings we get from our ComboBox::Model might be augmented
// with Unicode directionality marks before we insert them into the combobox
// and therefore we can not assume that the string we get from
// ui::ComboboxModel can be safely searched for and selected (which is what
// CB_SELECTSTRING does).
SendMessage(native_view(), CB_SETCURSEL, combobox_->selected_index(), 0);
}
void NativeComboboxWin::UpdateEnabled() {
SetEnabled(combobox_->enabled());
}
int NativeComboboxWin::GetSelectedIndex() const {
LRESULT selected_index = SendMessage(native_view(), CB_GETCURSEL, 0, 0);
return selected_index != CB_ERR ? selected_index : -1;
}
bool NativeComboboxWin::IsDropdownOpen() const {
return SendMessage(native_view(), CB_GETDROPPEDSTATE, 0, 0) != 0;
}
gfx::Size NativeComboboxWin::GetPreferredSize() {
COMBOBOXINFO cbi = { 0 };
cbi.cbSize = sizeof(cbi);
// Note: Don't use CB_GETCOMBOBOXINFO since that crashes on WOW64 systems
// when you have a global message hook installed.
GetComboBoxInfo(native_view(), &cbi);
gfx::Rect rect_item(cbi.rcItem);
gfx::Rect rect_button(cbi.rcButton);
gfx::Size border = ui::NativeThemeWin::instance()->GetThemeBorderSize(
ui::NativeThemeWin::MENULIST);
// The padding value of '3' is the xy offset from the corner of the control
// to the corner of rcItem. It does not seem to be queryable from the theme.
// It is consistent on all versions of Windows from 2K to Vista, and is
// invariant with respect to the combobox border size. We could conceivably
// get this number from rect_item.x, but it seems fragile to depend on
// position here, inside of the layout code.
const int kItemOffset = 3;
int item_to_button_distance = std::max(kItemOffset - border.width(), 0);
// The cx computation can be read as measuring from left to right.
int pref_width = std::max(kItemOffset + content_width_ +
kComboboxExtraPaddingX +
item_to_button_distance + rect_button.width() +
border.width(), kMinComboboxWidth);
// The two arguments to ::max below should be typically be equal.
int pref_height = std::max(rect_item.height() + 2 * kItemOffset,
rect_button.height() + 2 * border.height());
return gfx::Size(pref_width, pref_height);
}
View* NativeComboboxWin::GetView() {
return this;
}
void NativeComboboxWin::SetFocus() {
OnFocus();
}
void NativeComboboxWin::ValidityStateChanged() {
// TODO(estade): implement.
}
bool NativeComboboxWin::HandleKeyPressed(const ui::KeyEvent& event) {
return false;
}
bool NativeComboboxWin::HandleKeyReleased(const ui::KeyEvent& event) {
return false;
}
void NativeComboboxWin::HandleFocus() {
}
void NativeComboboxWin::HandleBlur() {
}
gfx::NativeView NativeComboboxWin::GetTestingHandle() const {
return native_view();
}
////////////////////////////////////////////////////////////////////////////////
// NativeComboboxWin, NativeControlWin overrides:
bool NativeComboboxWin::ProcessMessage(UINT message,
WPARAM w_param,
LPARAM l_param,
LRESULT* result) {
if (message == WM_COMMAND && HIWORD(w_param) == CBN_SELCHANGE) {
combobox_->SelectionChanged();
*result = 0;
return true;
}
return NativeControlWin::ProcessMessage(message, w_param, l_param, result);
}
void NativeComboboxWin::CreateNativeControl() {
// It's ok to add WS_VSCROLL. The scrollbar will show up only when necessary
// as long as we don't use CBS_DISABLENOSCROLL.
// See http://msdn.microsoft.com/en-us/library/7h63bxbe(VS.80).aspx
DWORD flags = WS_CHILD | WS_CLIPSIBLINGS | WS_CLIPCHILDREN |
CBS_DROPDOWNLIST | WS_VSCROLL;
HWND control_hwnd = ::CreateWindowEx(GetAdditionalExStyle(), L"COMBOBOX", L"",
flags, 0, 0, width(), height(),
GetWidget()->GetNativeView(), NULL, NULL,
NULL);
ui::CheckWindowCreated(control_hwnd);
NativeControlCreated(control_hwnd);
}
void NativeComboboxWin::NativeControlCreated(HWND native_control) {
NativeControlWin::NativeControlCreated(native_control);
UpdateFont();
}
////////////////////////////////////////////////////////////////////////////////
// NativeComboboxWin, private:
void NativeComboboxWin::UpdateFont() {
HFONT font = Combobox::GetFont().GetNativeFont();
SendMessage(native_view(), WM_SETFONT, reinterpret_cast<WPARAM>(font), FALSE);
}
////////////////////////////////////////////////////////////////////////////////
// NativeComboboxWrapper, public:
// static
NativeComboboxWrapper* NativeComboboxWrapper::CreateWrapper(
Combobox* combobox) {
return new NativeComboboxViews(combobox);
}
} // namespace views
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