I have a winforms application. In my application I have a user control which I loaded programmatically.
Inside this user-control I have tree view that also will be loaded with items programmatically. My problem is that I want to make my tree-view take the whole size of its parent.
What I have tried
I set the user-control Dock property to DockStyle.Fill to make it take the size of its parent.
I have done the same for the tree-view Dock property; set it to DockStyle.Fill.
What I get
The user-control takes the full size as expected but the tree-view looks like it is hidden. I checked the height, and I noticed it's 0. When I tried to change the height while it has DockStyle.Fill I can't, it changes back to 0.
Any ideas?
Update
The auto generated code for the tree-view:
private void InitializeComponent()
{
this.btnAddServer = new System.Windows.Forms.Button();
this.pnlServersContainer = new System.Windows.Forms.FlowLayoutPanel();
this.treeViewServers = new System.Windows.Forms.TreeView();
this.pnlServersContainer.SuspendLayout();
this.SuspendLayout();
//
// btnAddServer
//
this.btnAddServer.Location = new System.Drawing.Point(89, 478);
this.btnAddServer.Name = "btnAddServer";
this.btnAddServer.Size = new System.Drawing.Size(107, 23);
this.btnAddServer.TabIndex = 3;
this.btnAddServer.Text = "Add New Server";
this.btnAddServer.UseVisualStyleBackColor = true;
this.btnAddServer.Click += new System.EventHandler(this.btnAddServer_Click);
//
// pnlServersContainer
//
this.pnlServersContainer.AutoScroll = true;
this.pnlServersContainer.Controls.Add(this.treeViewServers);
this.pnlServersContainer.Dock = System.Windows.Forms.DockStyle.Fill;
this.pnlServersContainer.Location = new System.Drawing.Point(0, 0);
this.pnlServersContainer.Name = "pnlServersContainer";
this.pnlServersContainer.Padding = new System.Windows.Forms.Padding(8, 20, 0, 0);
this.pnlServersContainer.Size = new System.Drawing.Size(318, 463);
this.pnlServersContainer.TabIndex = 2;
//
// treeViewServers
//
this.treeViewServers.Dock = System.Windows.Forms.DockStyle.Fill;
this.treeViewServers.Location = new System.Drawing.Point(11, 23);
this.treeViewServers.Name = "treeViewServers";
this.treeViewServers.Size = new System.Drawing.Size(275, 0);
this.treeViewServers.TabIndex = 0;
this.treeViewServers.DoubleClick += new System.EventHandler(this.treeViewServers_DoubleClick);
//
// ucServersList
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
this.Controls.Add(this.btnAddServer);
this.Controls.Add(this.pnlServersContainer);
this.Name = "ucServersList";
this.Padding = new System.Windows.Forms.Padding(0, 0, 0, 60);
this.Size = new System.Drawing.Size(318, 523);
this.Load += new System.EventHandler(this.ucServersList_Load);
this.pnlServersContainer.ResumeLayout(false);
this.ResumeLayout(false);
}
I recommend to open Document outline editor in Visual Studio.
This shows all controls in their hierarchical order as tree.
It lets you also drag & drop the controls to the right place.
Open it with View > Other windows > Document outline.
You may fix your problem when looking at the controls order.
I have figured it out. but still don't know why this happened!
my tree-view was inside FlowLayoutPanel not Panel. When i changed it to Panel everything goes fine. that's it!
The problem might be that you have added several items to the same parent control, and then when you fill the parent dock with one of them, the behaviour would not be what you expect.
Use a splitcontainer. And when you want to fill out the dock, make sure your control belongs to two differnt panels of a splitcontainer.
See this for an concrete example.
Is there any specific reason why you use FlowLayoutPanel?
It seems that the FlowLayoutPanel does not deal with any other than Dock.None.
I think you should use a simple Panel for this application, because it does not resize the contained controls - the Dock property behaves as expected.
Replacing the FlowLayoutPanel with a Panel will fix your problem.
This is a super old question... but since there are no accepted answers I’ll give it a go.
This happened to me when my Control was set to autosize. Either removing autosize or specifying a minimum height could solve this issue.
Related
is it possible to add elements like panel to a listbox, listview or other list with .items?
I want to create panels with other elements like labels, checkbox, buttons,.. on a panel.
The panel should then be in a list so that I can check it for example: checkbox (which is on the panel) and is active in the list is showing, the other elements should be hidden in the list.
If a panel is between 2 panels, it should move upwards so that there is no space in between. If I then only display the panels of the non-activated elements, the hidden ones should be displayed again and the displayed ones should be hidden.
I would like to control this display using button event,
show everything,
only activated and
only deactivated.
With another button I would like to be able to bring a panel to the top position if it was declared as a favorite. if the favorite is removed again it should go back to where it was before.
In addition, I would then like to create a search mask that only displays the elements that match the search string when entered.
The only way I found is with listbox1.Controls.Add(panel1); for it to appear.
Unfortunately it doesn't work with listbox1.Items. :(
So I don't have a selectedItem either....
Here is my code that I have so far:
private void Reload_Click(object sender, EventArgs e)
{
Panel panel1 = new Panel();
panel1.Size = new Size (250, 35);
panel1.BackColor = Color.Red;
panel1.ForeColor = Color.Green;
panelxy.Dock = DockStyle.Top;
Panel panel2 = new Panel();
panel2.Size = new Size(250, 35);
panel2.BackColor = Color.Blue;
panel2.ForeColor = Color.Green;
panel2.Dock = DockStyle.Top;
listBox1.Controls.Add(panel1);
listBox1.Controls.Add(panel2);
Button btn_1 = new Button();
btn_1 .Size = new Size(200, 30);
btn_1 .Location = new Point(5, 2);
btn_1 .ForeColor = Color.Blue;
btn_1 .BackColor = Color.Yellow;
btn_1 .Font = new Font("Sitka Text", 15F, (FontStyle)(FontStyle.Bold | FontStyle.Italic), GraphicsUnit.Point, (byte) 0);
btn_1 .Text = "testbutton";
panel1.Controls.Add(btn_1 );
}
And here a Picture to show that:
listbox_elements
I hope someone can help me here. :)
thanks and BR
Cusy
Super thank you!
I just found out that it is possible to realize the required with a TableLayoutPanel. :)
Since I already have about 7000 lines of code, I don't want to convert it to WPF. ;)
i think the Answer from "Jimi" with FlowLayoutPanel are also a Solution. :)
Thanks
BR Cusy
In my winform control I am adding picture box and assigning an image from the Resources. This works great, however I need to change the image based on business logic and this is where the issue begins. I am setting up the Image to the new one but it refuses to get updated. I have also tried to use Refresh, Update or Invalidate on a picturebox again without any success. How to change the picturebox image dynamically ? Am I using the right control?
Below is Designer autogenerated code which works fine:
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.pictureBox1 = new System.Windows.Forms.PictureBox();
((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();
this.SuspendLayout();
//
// pictureBox1
//
this.pictureBox1.Dock = System.Windows.Forms.DockStyle.Fill;
this.pictureBox1.Image = global::UnumIDOutlookAddIn.Properties.Resources.MyImage;
this.pictureBox1.Location = new System.Drawing.Point(0, 0);
this.pictureBox1.Name = "pictureBox1";
this.pictureBox1.Size = new System.Drawing.Size(616, 86);
this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.Zoom;
this.pictureBox1.TabIndex = 1;
this.pictureBox1.TabStop = false;
//
// WinformComponent
//
this.AutoScaleDimensions = new System.Drawing.SizeF(9F, 20F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.Controls.Add(this.pictureBox1);
this.Name = "WinformComponent";
this.Size = new System.Drawing.Size(616, 86);
(this.pictureBox1)).EndInit();
this.ResumeLayout(false);
}
However, later on I am trying to update the Image, and it never updates. I have tried to differnt order on the last three lines without any success as well.
mycomponent.pictureBox1.Image = Resources.AnotherImage;
mycomponent.pictureBox1.Invalidate(); <-- Tried many configuratons
mycomponent.pictureBox1.Update();
mycomponent.pictureBox1.Refresh();
** I'm completely guessing as to what your problem is. **
Most likely you're doing something like this:
Form1 mycomponent = new Form1(); // Form1 is just an example
mycomponent.pictureBox1.Image = Resources.AnotherImage;
You're making a NEW form and updating the pictureBox on that Form, a Form that is never actually displayed.
If you want to update the Form that is ALREADY VISIBLE on your screen, then you need a reference to that specific form.
Getting a reference to the visible form can be done in various ways. Understanding the CONTEXT of your program will allow us to give you the easiest method to do this.
What forms are involved? Which forms create which ones, in what order? These things matter...
At runtime I add (and remove) several controls, as needed, to a main window which in Designer contains only a ToolStrip with some function buttons. In some cases I want to add an info label next to the toolStrip, but I cannot make it visible, ie. it is hidden below. The code for the label is straightforward
infoLabel = new Label();
infoLabel.AutoSize = true;
infoLabel.Location = new System.Drawing.Point(200, 10);
infoLabel.Size = new System.Drawing.Size(35, 13);
infoLabel.BackColor = System.Drawing.SystemColors.Control;
infoLabel.Font = new System.Drawing.Font("Arial", 13);
infoLabel.ForeColor = System.Drawing.Color.Black;
infoLabel.TabIndex = 1;
infoLabel.Text = "this is info";
infoLabel.BringToFront();
this.Controls.Add(infoLabel);
TabIndex and BringToFront I added as an act of desperation, it does not help. BTW the ToolStrip's TabIndex is 2, and its BackColor I changed to transparent.
However, when I placed a label over the ToolStrip in the Designer, it is visible (ie. on top). I analysed the code then but did not see anything different from what I am writing. What am I missing here?
I suggest calling infoLabel.BringToFront(); at the very end, at least after this.Controls.Add(infoLabel); you current code amended:
infoLabel = new Label();
...
infoLabel.Text = "this is info";
// First Add to this
this.Controls.Add(infoLabel);
// Only then we can make infoLabel be the topmost
// among all existing controls which are on this
infoLabel.BringToFront();
We create infoLabel, add it to this and finally make it topmost on this. To make code more readable I suggest something like this:
// Create a label on this
infoLabel = new Label() {
AutoSize = true,
Location = new System.Drawing.Point(200, 10),
Size = new System.Drawing.Size(35, 13),
BackColor = System.Drawing.SystemColors.Control,
Font = new System.Drawing.Font("Arial", 13),
ForeColor = System.Drawing.Color.Black,
TabIndex = 1,
Text = "this is info",
Parent = this // <- instead of this.Controls.Add(infoLabel);
};
// make infoLabel topmost among all controls on this
infoLabel.BringToFront();
Windows Forms controls do not have a property which you can use to set z-index of controls like one can do in CSS.
You'll need to call Parent.SetChildIndex(control, 0);. The control at the front of Controls collection is the topmost in z-order for a container control.
I'm creating a windows form that will programatically add a panel to another panel. I'm trying to customize the various properties of the new panel, such as color, and size, which works. However when I try to modify the margin, nothing works. I cannot find the Thickness struct either, since it's not a WPF app, it's a Windows Forms Application. Here is my code:
private void buttonAddExercise_Click(object sender, EventArgs e)
{
Panel panel = new Panel();
panel.BackColor = Color.White;
panel.Size = new Size(200, 300);
panel.Margin = new Padding(20);
listOfExercisePanels.Add(panel);
panelNewWorkout.Controls.Add(panel);
}
Firstly
To use Thickness you need to create/change your project .NET framework platform
version to .NET Framework 4.5. because this method available only in version 4.5
Secondly
You must add DockStyle to Fill for Child components as:
Panel panel = new Panel();
panel.BackColor = Color.White;
panel.Size = new Size(200, 200);
Label lb = new Label() { Text = "Hello" };
panel.Padding = new Padding(10);
lb.Dock = System.Windows.Forms.DockStyle.Fill;
panel.Controls.Add(lb);
this.Controls.Add(panel);
Thirdly
If you want to change Margin of the panel, you can put it into another parent panel
Add a reference to "PresentationFramework.dll",
and a using statement for:
using System.Windows;
PresentationFramework is not included as a reference by default.
I was developing a WinForm application for a class and I ran into a bug that I can't seem to find the root of. When I run the application everything works except for an error label that was supposed to come up with incorrect user input. At first I thought I had written the event handler for it wrong, so I stopped hiding it at startup but the label is still missing. I'm not sure if I'm missing something in some back-end file or if I'm just missing something really obvious.
This is the function that creates the label.
private void InitializeErrorLabel()
{
int width = 200, height = 13,
anchorY = this.Label.Location.Y - this.Label.Size.Height - 3;
// Initialize Component
this.ErrorLabel.AutoSize = true;
this.ErrorLabel.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Bold,
System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.ErrorLabel.ForeColor = System.Drawing.Color.Red;
this.ErrorLabel.Location = new System.Drawing.Point((XSize - width) / 2, (anchorY - height));
this.ErrorLabel.Anchor = System.Windows.Forms.AnchorStyles.Top;
this.ErrorLabel.Name = "ErrorLabel";
this.ErrorLabel.Size = new System.Drawing.Size(width, height);
this.ErrorLabel.Text = "Invalid User ID. Please try again!";
return;
}
and this is the function that initializes my controls:
private void InitializeComponent()
{
this.UserInput = new System.Windows.Forms.TextBox();
this.SwitchMajor = new System.Windows.Forms.RadioButton();
this.SwitchToCS = new System.Windows.Forms.CheckBox();
this.SwitchToCE = new System.Windows.Forms.CheckBox();
this.KeepMajor = new System.Windows.Forms.RadioButton();
this.AcceptValues = new System.Windows.Forms.Button();
this.Label = new System.Windows.Forms.Label();
this.ErrorLabel = new System.Windows.Forms.Label();
this.SuspendLayout();
// Initialize Components
this.InitializeLabel();
this.InitializeMainWindow();
this.InitializeUserInput();
this.InitializeSwitchMajorBtn();
this.InitializeChangeToCSBtn();
this.InitializeChangeToCEBtn();
this.InitializeAcceptValuesBtn();
this.InitializeErrorLabel();
this.ResumeLayout();
this.PerformLayout();
return;
}
Again, not really sure what I'm doing wrong here. Any help would be appreciated.
Thanks,
In what control are you adding your errorlabel ?
A normal label initialization should look like
private System.Windows.Forms.Label ErrorLabel;
this.ErrorLabel = new System.Windows.Forms.Label();
this.groupBox2.Controls.Add(this.ErrorLabel);
this.ErrorLabel.AutoSize = true;
this.ErrorLabel.Location = new System.Drawing.Point(8, 59);
this.ErrorLabel.Name = "ErrorLabel";
this.ErrorLabel.Size = new System.Drawing.Size(55, 13);
this.ErrorLabel.TabIndex = 69;
this.ErrorLabel.Text = "Address 2";
this.ErrorLabel.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
Important
The label must be added to a control like my line three. Your control can be a form in your case. Its a groupbox in my case and the group box itself must be added to myform and myform must be visible .
this.groupBox2.Controls.Add(this.ErrorLabel);
I don't see a place where you're adding the label to the form's collection of controls:
this.Controls.Add(this.ErrorLabel);
If it's not a member of the Controls collection, you won't see it.
Related to that, I wouldn't be surprised if the other buttons, checkboxes, etc you're defining are not showing up on the form either, for the same reason.
Normally this would be taken care of by the Designer.cs file automatically.
This might be an obvious answer, but it totally went over my head. I verified that my code had the this.groupBox2.Controls.Add(this.ErrorLabel); like others have mentioned here. I couldn't figure out why I wasn't seeing my label. My label was an asterisk *, and in the designer window, I size it pretty small, but I was able to see the * in the designer window. Turns out I just had to increase it's area in the designer window since it was to small when I actually rendered the App.