1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "chrome/views/combo_box.h"
#include "base/gfx/native_theme.h"
#include "base/gfx/rect.h"
#include "chrome/common/gfx/chrome_canvas.h"
#include "chrome/common/gfx/chrome_font.h"
#include "chrome/common/resource_bundle.h"
// Limit how small a combobox can be.
static const int kMinComboboxWidth = 148;
// Add a couple extra pixels to the widths of comboboxes and combobox
// dropdowns so that text isn't too crowded.
static const int kComboboxExtraPaddingX = 6;
namespace ChromeViews {
ComboBox::ComboBox(Model* model)
: model_(model), selected_item_(0), listener_(NULL), content_width_(0) {
}
ComboBox::~ComboBox() {
}
void ComboBox::SetListener(Listener* listener) {
listener_ = listener;
}
void ComboBox::GetPreferredSize(CSize* out) {
HWND hwnd = GetNativeControlHWND();
if (!hwnd)
return;
COMBOBOXINFO cbi;
memset(reinterpret_cast<unsigned char*>(&cbi), 0, sizeof(cbi));
cbi.cbSize = sizeof(cbi);
::SendMessage(hwnd, CB_GETCOMBOBOXINFO, 0, reinterpret_cast<LPARAM>(&cbi));
gfx::Rect rect_item(cbi.rcItem);
gfx::Rect rect_button(cbi.rcButton);
gfx::Size border = gfx::NativeTheme::instance()->GetThemeBorderSize(
gfx::NativeTheme::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.
out->cx = 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.
out->cy = std::max(rect_item.height() + 2 * kItemOffset,
rect_button.height() + 2 * border.height());
}
HWND ComboBox::CreateNativeControl(HWND parent_container) {
HWND r = ::CreateWindowEx(GetAdditionalExStyle(), L"COMBOBOX", L"",
WS_CHILD | WS_VSCROLL | CBS_DROPDOWNLIST,
0, 0, GetWidth(), GetHeight(),
parent_container, NULL, NULL, NULL);
HFONT font = ResourceBundle::GetSharedInstance().
GetFont(ResourceBundle::BaseFont).hfont();
SendMessage(r, WM_SETFONT, reinterpret_cast<WPARAM>(font), FALSE);
UpdateComboBoxFromModel(r);
return r;
}
LRESULT ComboBox::OnCommand(UINT code, int id, HWND source) {
HWND hwnd = GetNativeControlHWND();
if (!hwnd)
return 0;
if (code == CBN_SELCHANGE && source == hwnd) {
LRESULT r = ::SendMessage(hwnd, CB_GETCURSEL, 0, 0);
if (r != CB_ERR) {
int prev_selected_item = selected_item_;
selected_item_ = static_cast<int>(r);
if (listener_)
listener_->ItemChanged(this, prev_selected_item, selected_item_);
}
}
return 0;
}
LRESULT ComboBox::OnNotify(int w_param, LPNMHDR l_param) {
return 0;
}
void ComboBox::UpdateComboBoxFromModel(HWND hwnd) {
::SendMessage(hwnd, CB_RESETCONTENT, 0, 0);
ChromeFont font = ResourceBundle::GetSharedInstance().GetFont(
ResourceBundle::BaseFont);
int max_width = 0;
int num_items = model_->GetItemCount(this);
for (int i = 0; i < num_items; ++i) {
const std::wstring& text = model_->GetItemAt(this, i);
// Inserting the Unicode formatting characters if necessary so that the
// text is displayed correctly in right-to-left UIs.
std::wstring localized_text;
const wchar_t* text_ptr = text.c_str();
if (l10n_util::AdjustStringForLocaleDirection(text, &localized_text))
text_ptr = localized_text.c_str();
::SendMessage(hwnd, CB_ADDSTRING, 0, reinterpret_cast<LPARAM>(text_ptr));
max_width = std::max(max_width, font.GetStringWidth(text));
}
content_width_ = max_width;
if (num_items > 0) {
::SendMessage(hwnd, CB_SETCURSEL, selected_item_, 0);
// Set the width for the drop down while accounting for the scrollbar and
// borders.
if (num_items > ComboBox_GetMinVisible(hwnd))
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(hwnd, CB_SETDROPPEDWIDTH, max_width, 0);
}
}
void ComboBox::ModelChanged() {
HWND hwnd = GetNativeControlHWND();
if (!hwnd)
return;
selected_item_ = std::min(0, model_->GetItemCount(this));
UpdateComboBoxFromModel(hwnd);
}
void ComboBox::SetSelectedItem(int index) {
selected_item_ = index;
HWND hwnd = GetNativeControlHWND();
if (!hwnd)
return;
// 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 combo box
// and therefore we can not assume that the string we get from
// ComboBox::Model can be safely searched for and selected (which is what
// CB_SELECTSTRING does).
::SendMessage(hwnd, CB_SETCURSEL, selected_item_, 0);
}
int ComboBox::GetSelectedItem() {
return selected_item_;
}
}
|
