mdichild | 易学教程

Opening child form is causing mdiform to change size and shrink

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问题 I am having a basic problem opening a child form in an mdiForm. Dim frm As New Form1 frm.MdiParent = Me frm.Show() I have some code in the Form-Load event of the child form to open up connection to access db (connection opens fine). Try conn.Open() catch ex As Exception Msgbox("connection error") End Try MdiForm is set to open up in a Maximized state. When the app runs, mdiForm opens up normal and the Menustrip looks normal size as well. However, when I try to open up a child form (Form1 in

C#.Net Panel Control and MDI Child forms - issue

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问题 Hi i am stuck in MDIform with panel control. I have one panel control Docked (fill) to parent MDI form. When i try opening new child form with menu click event the child form doesn't show up in MDI container. After debugging few times, i set the visible property of panel control to false, the child form shows up now. what is causing this? is there any way that i can leave panel control as docked (fill) inside MDI container form and show the child form on top of that panel? 回答1: MDI child

Problem with controls in MDI form

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问题 I have placed a button on MDI form , now when I open a child form , the button remains on top and distracts the child form , is there a way to solve it? I have done following to send the button back when any child is activated.But I am wondering to call button1.BringToFront(); private void MDIParent1_MdiChildActivate(object sender, EventArgs e) { button1.SendToBack(); } I tried following but it doesnt work. private void MDIParent1_Enter(object sender, EventArgs e) { button1.BringToFront(); }

Allow multiple MDI Parent Forms on same Application

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问题 I'm trying follow what was suggested in this answer, changing this part of Vcl.Forms.pas : procedure TCustomForm.CreateWindowHandle(const Params: TCreateParams); var CreateStruct: TMDICreateStruct; NewParams: TCreateParams; begin if (FormStyle = fsMDIChild) and not (csDesigning in ComponentState) then begin {if (Application.MainForm = nil) or (Application.MainForm.ClientHandle = 0) then raise EInvalidOperation.Create(SNoMDIForm);} with CreateStruct do begin szClass := Params.WinClassName;

How to set MDIParent property of Child form in nonMDI Class?

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问题 I am working on MDI app which have Child Forms. I have to show Child Window once a certain conditions is met. I created a separate Class named clsDashbord having method loadDashboard() which is supposed to load frmDashboard already designed. Code is given below: public void loadDashboard(String userName) { _Dashboard = new frmDashboard(); _Main = new frmMDI(); // _Dashboard.MdiParent = _Main; _Dashboard.Text = userName; _Dashboard.Show(); } Form does not show up if I set MDIParent to Main

Why does the last MDI child form that was closed not get garbage collected?

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问题 We've had problems with memory leaks in our application. I've managed to replicate one of the problems with the following simple example: Replication setup 1) Create the following helper class which will be used to track object creation/destruction. public class TestObject { public static int Count { get; set; } public TestObject() { Count++; } ~TestObject() { Count--; } } 2) Create an MDI form with three buttons, the first button will create a new MDI child as follows: private void

How can I make MdiChild forms be in tabs in C#?

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I have a MDIparent Forma and which has some mdichild forms in it. Can you help me some how put the mdichilds in Tabs like google chrome , firefox , IE , Opera ... There's a good article on MDI forms with TabControls here: http://www.codeproject.com/KB/cs/MDITabBrowsing.aspx There's nothing really to be gained by using MDI once you have tabs. MDI is designed to handle multiple forms residing inside the same container. However, with tabs each form is in a different container. I can't see any benefit to using MDI in this scenario and would avoid it. Try something like this: myForm.TopLevel=false;

Allow multiple MDI Parent Forms on same Application

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I'm trying follow what was suggested in this answer, changing this part of Vcl.Forms.pas : procedure TCustomForm.CreateWindowHandle(const Params: TCreateParams); var CreateStruct: TMDICreateStruct; NewParams: TCreateParams; begin if (FormStyle = fsMDIChild) and not (csDesigning in ComponentState) then begin {if (Application.MainForm = nil) or (Application.MainForm.ClientHandle = 0) then raise EInvalidOperation.Create(SNoMDIForm);} with CreateStruct do begin szClass := Params.WinClassName; szTitle := Params.Caption; hOwner := THandle(HInstance); X := Params.X; Y := Params.Y; cX := Params.Width;

Why does the last MDI child form that was closed not get garbage collected?

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We've had problems with memory leaks in our application. I've managed to replicate one of the problems with the following simple example: Replication setup 1) Create the following helper class which will be used to track object creation/destruction. public class TestObject { public static int Count { get; set; } public TestObject() { Count++; } ~TestObject() { Count--; } } 2) Create an MDI form with three buttons, the first button will create a new MDI child as follows: private void ctlOpenMDI_Click(object sender, EventArgs e) { Form newForm = new Form(); newForm.MdiParent = this; newForm.Tag

Add a form to a MDI child

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问题 In Form1 I'm enabling IsMdiContainer and I added a MenuStrip . In Form1_Load I "new" Form2 and I'm assiging Form2.MdiParent to this which is Form1 . I'm also maximizing Form2 and this operation works well. In Form2 I have a treeView on the left side of the form and on the right side of the form I would like to display a number of different forms with various editing capabilities which will be dependent upon the node or level selected in the treeView . I would like to create a number of