windows-controls | 易学教程

WM_REFLECT_NOTIFY vs WM_NOTIFY

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问题 The documentation for WM_NOTIFY is easy enough to find, however I'm finding a fair amount of sample code and articles that refer to WM_REFLECT_NOTIFY , for which I can't find any documentation. What is WM_REFLECT_NOTIFY , where can I find the documentation for it and how is this message different from WM_NOTIFY ? Example references: Flickering in listview with ownerdraw and virtualmode ListViewSubItem.Bounds almost works 回答1: WM_REFLECT_NOTIFY is referred to as having value of 0x204E , that

How to enable a WinForm button in time to receive focus by tabbing

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问题 Visual Studio 2010, C# I have a ComboBox with a DropDown , AutoComplete set to SuggestAppend and the AutoCompleteSource is from the ListItems . The user keys data into it until the have the correct entry. Utill the data matches one of the list items, a button next to the combobox is disabled. If the user hits the tab key the autocomplete feature accepts current suggestion. It also moves on to the next control in tab sequence that is enabled. Of course since I want it to go to the disbabled

Synchronized Scrolling Components Delphi

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问题 I am trying to synchronize the scrolling of two TDBGrid components in a VCL Forms application, I am having difficulties intercepting the WndProc of each grid component without some stack issues. I have tried sending WM_VSCROLL messages under scrolling events but this still results in the incorrect operation. It needs to work for clicking the scrollbar, as well as highlighting a cell, or an up or down mouse button. The whole idea is to have two grids next to each other displaying a sort of

ComboBox with CheckBoxes in WinForms [closed]

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问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 10 months ago . I am trying to implement a CheckBox ComboBox. I followed this link as a reference http://www.codeproject.com/Articles/31105/A-ComboBox-with-a-CheckedListBox-as-a-Dropdown?msg=4152597#xx4152597xx But there are some problems with this example. 1) After the drop-down list is shown, the very first mouse single

Synchronized Scrolling Components Delphi

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I am trying to synchronize the scrolling of two TDBGrid components in a VCL Forms application, I am having difficulties intercepting the WndProc of each grid component without some stack issues. I have tried sending WM_VSCROLL messages under scrolling events but this still results in the incorrect operation. It needs to work for clicking the scrollbar, as well as highlighting a cell, or an up or down mouse button. The whole idea is to have two grids next to each other displaying a sort of matching dialog. Tried SendMessage( gridX.Handle, WM_VSCROLL, SB_LINEDOWN, 0 ); Also procedure TForm1

Find position of mouse relative to control, rather than screen

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问题 I have a Picture Box called BGImage . I hope that when the user clicks on this I can capture the position of the mouse relative to BGImage . I've tried using MousePosition , only to find it gives the mouse location on the screen, not on the PictureBox. So I also tried using PointToClient : Dim MousePos As Point = Me.PointToClient(MousePosition) But this gives me the location {X=1866,Y=55} whereas I actually clicked on the PictureBox at around {X=516,Y=284} . I think the problem arises because

Win32 - Appending text to an Edit Control

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问题 Trying to append text to an edit control inside a dialog box. I can't get _tcscat_s to append correctly. It crashes and says something about the buffer being too small or something about a null terminated string. int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow ) { return DialogBox( hInstance, MAKEINTRESOURCE( IDD_MAIN ), NULL, DlgProc ); } BOOL CALLBACK DlgProc( HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam ) { switch( Message ) { case