【发布时间】:2015-07-26 21:29:41
【问题描述】:
简介:
我正在尝试使用可编辑的子项来实现列表视图控件。对于项目/子项目的就地编辑,我使用编辑控件。
我相信我已经成功地将编辑控件放置在项目/子项目上方。
问题:
我不知道我应该在哪些事件上结束/取消子项编辑(隐藏编辑控件、设置子项文本等)以及我应该怎么做。
为了澄清,我说的是用户完成/取消就地编辑的时刻。
此时不再需要编辑控件,所以我应该隐藏它(我不喜欢每次都重新创建它;我相信创建一次然后在需要时显示/隐藏它会更有效)。
我的目标是 Properties 窗口在 Visual Studio 中的行为(请参阅附图以准确查看我所指的窗口)。
当用户按下 ESC 键/单击另一个窗口/单击滚动条等时,我希望以与此窗口相同的方式实现编辑/取消。
我为解决这个问题所做的努力:
使用谷歌,我发现了一些例子,但它们是旧的,并没有解决所有相关的案例,所以这就是我在这里寻求帮助的原因。
但是,我发现我必须考虑的事件之一是EN_KILLFOCUS,当用户按下 ESC/ENTER 键时的情况以及当用户点击了编辑控件以外的东西。
编辑:
我已经设法处理了 ESC 和 ENTER 键,以及当用户单击另一个同级控件或使用 ALT + TAB 切换窗口时的情况。我已经更新了 SSCCE 并进行了相关更改
问题:
为了实现网格的默认行为(如果有用于 Windows 应用程序的网格),我必须处理哪些消息/事件?
你能否指出我应该在哪里编辑子项和隐藏编辑控件,我应该在哪里隐藏编辑控件?
编辑:
我唯一剩下的问题是处理用户单击列表视图滚动条或主窗口背景时的情况。我只是不知道如何处理这个问题,希望能得到所有帮助。
相关信息:
我在 Windows 7 x86 上使用 Visual Studio 2013;
我正在使用原始 WinAPI 在 C++ 中进行开发;
SSCCE:
以下是我目前的解决方案。我试图彻底评论它,但如果需要更多信息,请发表评论,我会更新我的帖子。
#include <windows.h>
#include <windowsx.h> // various listview macros etc
#include <CommCtrl.h>
#include <stdio.h> // swprintf_s()
// enable Visual Styles
#pragma comment( linker, "/manifestdependency:\"type='win32' \
name='Microsoft.Windows.Common-Controls' version='6.0.0.0' \
processorArchitecture='*' publicKeyToken='6595b64144ccf1df' \
language='*'\"")
// link with Common Controls library
#pragma comment( lib, "comctl32.lib")
//global variables
HINSTANCE hInst;
// listview subclass procedure
LRESULT CALLBACK ListViewSubclassProc(HWND hwnd, UINT message,
WPARAM wParam, LPARAM lParam,
UINT_PTR uIdSubclass, DWORD_PTR dwRefData)
{
switch (message)
{
case WM_VSCROLL:
case WM_HSCROLL:
// if edit control has the focus take it away and give to listview
if (GetFocus() == GetDlgItem(GetParent(hwnd), 5000))
SetFocus(hwnd); // use WM_NEXTDLGCTL for dialogbox !!!!
break;
case WM_NCDESTROY:
::RemoveWindowSubclass(hwnd, ListViewSubclassProc, uIdSubclass);
return DefSubclassProc(hwnd, message, wParam, lParam);
}
return ::DefSubclassProc(hwnd, message, wParam, lParam);
}
// subclass procedure for edit control
LRESULT CALLBACK InPlaceEditControl_SubclassProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam,
UINT_PTR uIdSubclass, DWORD_PTR dwRefData)
{
switch (message)
{
case WM_GETDLGCODE:
return (DLGC_WANTALLKEYS | DefSubclassProc(hwnd, message, wParam, lParam));
case WM_KILLFOCUS:
ShowWindow(hwnd, SW_HIDE);
return DefSubclassProc(hwnd, message, wParam, lParam);
case WM_CHAR:
//Process this message to avoid message beeps.
switch (wParam)
{
case VK_RETURN:
return 0L;
case VK_ESCAPE:
return 0L;
default:
return ::DefSubclassProc(hwnd, message, wParam, lParam);
}
break;
case WM_KEYDOWN:
switch (wParam)
{
case VK_RETURN:
{
// get listview handle
HWND hwndLV = GetDlgItem(GetParent(hwnd), 2000);
// get edit control's client rectangle
RECT rc = { 0 };
GetClientRect(hwnd, &rc);
// since edit control lies inside item rectangle
// we can test any coordinate inside edit control's
// client rectangle
// I chose ( rc.left, rc.top )
MapWindowPoints(hwnd, hwndLV, (LPPOINT)&rc, (sizeof(RECT) / sizeof(POINT)));
// get item and subitem indexes
LVHITTESTINFO lvhti = { 0 };
lvhti.pt.x = rc.left;
lvhti.pt.y = rc.top;
ListView_SubItemHitTest(hwndLV, &lvhti);
// get edit control's text
wchar_t txt[50] = L"";
Edit_GetText(hwnd, txt, 50);
// edit cell text
ListView_SetItemText(hwndLV, lvhti.iItem, lvhti.iSubItem, txt);
// restore focus to listview
// this triggers EN_KILLFOCUS
// which will hide edit control
SetFocus(hwndLV);
}
return 0L;
case VK_ESCAPE:
SetFocus(GetDlgItem(GetParent(hwnd), 2000));
return 0L;
default:
return ::DefSubclassProc(hwnd, message, wParam, lParam);
}
break;
case WM_NCDESTROY:
::RemoveWindowSubclass(hwnd, InPlaceEditControl_SubclassProc, uIdSubclass);
return DefSubclassProc(hwnd, message, wParam, lParam);
}
return ::DefSubclassProc(hwnd, message, wParam, lParam);
}
// main window procedure
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch (msg)
{
case WM_CREATE:
{
//================ create controls
RECT rec = { 0 };
GetClientRect(hwnd, &rec);
HWND hwndLV = CreateWindowEx(0, WC_LISTVIEW,
L"", WS_CHILD | WS_VISIBLE | WS_BORDER | WS_CLIPSIBLINGS | LVS_REPORT,
50, 50, 250, 200, hwnd, (HMENU)2000, hInst, 0);
// in place edit control
HWND hwndEdit = CreateWindowEx(0, WC_EDIT, L"", ES_AUTOHSCROLL | WS_CHILD | WS_BORDER,
200, 265, 100, 25, hwnd, (HMENU)5000, hInst, 0);
// edit control must have the same font as listview
HFONT hf = (HFONT)SendMessage(hwndLV, WM_GETFONT, 0, 0);
if (hf)
SendMessage(hwndEdit, WM_SETFONT, (WPARAM)hf, (LPARAM)TRUE);
// subclass edit control, so we can edit subitem with ENTER, or
// cancel editing with ESC
SetWindowSubclass(hwndEdit, InPlaceEditControl_SubclassProc, 0, 0);
// set extended listview styles
ListView_SetExtendedListViewStyle(hwndLV, LVS_EX_FULLROWSELECT | LVS_EX_GRIDLINES | LVS_EX_DOUBLEBUFFER);
// subclass listview
SetWindowSubclass(hwndLV, ListViewSubclassProc, 0, 0);
// add some columns
LVCOLUMN lvc = { 0 };
lvc.mask = LVCF_FMT | LVCF_WIDTH | LVCF_TEXT | LVCF_SUBITEM;
lvc.fmt = LVCFMT_LEFT;
for (long nIndex = 0; nIndex < 5; nIndex++)
{
wchar_t txt[50];
swprintf_s(txt, 50, L"Column %d", nIndex);
lvc.iSubItem = nIndex;
lvc.cx = 60;
lvc.pszText = txt;
ListView_InsertColumn(hwndLV, nIndex, &lvc);
}
// add some items
LVITEM lvi;
lvi.mask = LVIF_TEXT;
for (lvi.iItem = 0; lvi.iItem < 10000; lvi.iItem++)
{
for (long nIndex = 0; nIndex < 5; nIndex++)
{
wchar_t txt[50];
swprintf_s(txt, 50, L"Item %d%d", lvi.iItem, nIndex);
lvi.iSubItem = nIndex;
lvi.pszText = txt;
if (!nIndex) // item
SendDlgItemMessage(hwnd, 2000, LVM_INSERTITEM, 0, reinterpret_cast<LPARAM>(&lvi));
else // sub-item
SendDlgItemMessage(hwnd, 2000, LVM_SETITEM, 0, reinterpret_cast<LPARAM>(&lvi));
}
}
}
return 0L;
case WM_NOTIFY:
{
if (((LPNMHDR)lParam)->code == NM_DBLCLK)
{
switch (((LPNMHDR)lParam)->idFrom)
{
case 2000: // remember, this was our listview's ID
{
LPNMITEMACTIVATE lpnmia = (LPNMITEMACTIVATE)lParam;
// SHIFT/ALT/CTRL/their combination, must not be pressed
if ((lpnmia->uKeyFlags || 0) == 0)
{
// store item/subitem rectangle
RECT rc = { 0, 0, 0, 0 };
// helper values, needed for handling partially visible items
int topIndex = ListView_GetTopIndex(lpnmia->hdr.hwndFrom);
int visibleCount = ListView_GetCountPerPage(lpnmia->hdr.hwndFrom);
// if item is vertically partially visible, make it fully visible
if ((topIndex + visibleCount) == lpnmia->iItem)
{
// get the rectangle of the above item -> lpnmia->iItem - 1
ListView_GetSubItemRect(lpnmia->hdr.hwndFrom, lpnmia->iItem - 1, lpnmia->iSubItem, LVIR_LABEL, &rc);
// ensure clicked item is visible
ListView_EnsureVisible(lpnmia->hdr.hwndFrom, lpnmia->iItem, FALSE);
}
else // item is fully visible, just get its ectangle
ListView_GetSubItemRect(lpnmia->hdr.hwndFrom, lpnmia->iItem, lpnmia->iSubItem, LVIR_LABEL, &rc);
RECT rcClient = { 0 }; // listview client rectangle, needed if item partially visible
GetClientRect(lpnmia->hdr.hwndFrom, &rcClient);
// item is horizontally partially visible -> from the right side
if (rcClient.right < rc.right)
{
// show the whole item
ListView_Scroll(lpnmia->hdr.hwndFrom, rc.right - rcClient.right, 0);
// adjust rectangle so edit control is properly displayed
rc.left -= rc.right - rcClient.right;
rc.right = rcClient.right;
}
// item is horizontally partially visible -> from the left side
if (rcClient.left > rc.left)
{
// show the whole item
ListView_Scroll(lpnmia->hdr.hwndFrom, rc.left - rcClient.left, 0);
// adjust rectangle so edit control is properly displayed
rc.right += rcClient.left - rc.left;
rc.left = rcClient.left;
}
// it is time to position edit control, we start by getting its window handle
HWND hwndEdit = GetDlgItem(hwnd, 5000);
// get item text and set it as edit control's text
wchar_t text[51];
ListView_GetItemText(lpnmia->hdr.hwndFrom, lpnmia->iItem, lpnmia->iSubItem, text, 50);
Edit_SetText(hwndEdit, text);
// select entire text
Edit_SetSel(hwndEdit, 0, -1);
// map listview client rectangle to parent rectangle
// so edit control can be properly placed above the item
MapWindowPoints(lpnmia->hdr.hwndFrom, hwnd, (LPPOINT)&rc, (sizeof(RECT) / sizeof(POINT)));
// move the edit control
SetWindowPos(hwndEdit, HWND_TOP, rc.left, rc.top, rc.right - rc.left,
rc.bottom - rc.top, SWP_SHOWWINDOW);
// set focus to our edit control
HWND previousWnd = SetFocus(hwndEdit);
}
}
break;
default:
break;
}
}
}
break;
case WM_CLOSE:
::DestroyWindow(hwnd);
return 0L;
case WM_DESTROY:
{
::PostQuitMessage(0);
}
return 0L;
default:
return ::DefWindowProc(hwnd, msg, wParam, lParam);
}
return 0;
}
// WinMain
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine,
int nCmdShow)
{
// store hInstance in global variable for later use
hInst = hInstance;
WNDCLASSEX wc;
HWND hwnd;
MSG Msg;
// register main window class
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = 0;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInst;
wc.hIcon = LoadIcon(hInstance, IDI_APPLICATION);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = GetSysColorBrush(COLOR_WINDOW);
wc.lpszMenuName = NULL;
wc.lpszClassName = L"Main_Window";
wc.hIconSm = LoadIcon(hInstance, IDI_APPLICATION);
if (!RegisterClassEx(&wc))
{
MessageBox(NULL, L"Window Registration Failed!", L"Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}
// initialize common controls
INITCOMMONCONTROLSEX iccex;
iccex.dwSize = sizeof(INITCOMMONCONTROLSEX);
iccex.dwICC = ICC_LISTVIEW_CLASSES | ICC_STANDARD_CLASSES;
InitCommonControlsEx(&iccex);
// create main window
hwnd = CreateWindowEx(0, L"Main_Window", L"Grid control",
WS_OVERLAPPEDWINDOW, 50, 50, 400, 400, NULL, NULL, hInstance, 0);
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
while (GetMessage(&Msg, NULL, 0, 0) > 0)
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;
}
【问题讨论】:
-
我运行了你的代码,它看起来不错,只是它不处理编辑控件的 Esc 和 Return 键。您必须对编辑控件进行子类化才能捕获这两个键。 ListView 也有自己的 LabelEdit 函数,但是 ListView 默认的 Edit 只适用于第一列。
-
@BarmakShemirani:尝试单击主窗口,您将看到编辑控件没有收到
EN_KILLFOCUS。当我控制列表视图的滚动条时也会发生同样的情况。在这两种情况下应该隐藏它。我只是不知道我必须处理哪个事件才能隐藏控件...感谢您花时间尝试和帮助。我非常感谢。希望我的问题将得到解决,您和许多其他人将从该解决方案中受益。最好的问候。 -
关于编辑控件未被子类化的任何更新?我想知道你是如何让它工作的;我尝试使用 SetWindowLong 在 NM_DBLCLK 消息中对其进行子类化,但随后窗口冻结并触发断点。我真的很想知道你是怎么做到的。
-
@user2154149:我已经修复了您指出的错误并添加了完整的示例代码。我希望代码对你有帮助。最好的问候和祝你好运,如果您需要进一步的帮助,请告诉我。
-
很好,很好的解释。但是如果 SubItem 部分不可见,我会从 ListView_SubItemHitTest (hwndLV, & lvhti) 得到错误的 lvhti.iSubItem。奇怪的。我认为最好将 iSubItem 设置为编辑窗口的参数(SetWindowLongPtr),以便它直接挂钩到正确的 SubItem?我也想知道,为什么要隐藏编辑窗口,什么时候可以在需要时销毁和重新创建它?那么有没有风险,忘记销毁呢?有两个功能,开始和结束编辑,会很顺利,我做。但最后不是这里的主题。
标签: c++ c listview winapi datagrid