I have a form with a number of radiobuttons where only one should be selected at a time.
Some of the radiobuttons are connected and need to bee explained by a header. For this i put them in a Groupbox. But then is the radiobuttons inside the groupbox no longer connected to the ones outside and its possible to select two off them.
Is there a way to connect the radiobuttons so they all react on eachother? Or is there a better way to group and explain the radiobuttons then using a groupbox?
It is the designed behavior of a RadioButton to be grouped by its container according to MSDN:
When the user selects one option button (also known as a radio button)
within a group, the others clear automatically. All RadioButton
controls in a given container, such as a Form, constitute a group. To
create multiple groups on one form, place each group in its own
container, such as a GroupBox or Panel control
You could try using a common eventhandler for the RadioButtons that you want linked and handle the Checking/UnChecking yourself, Or you can place your RadioButtons on top of your GroupBox, not adding them to the GroupBox then BringToFront.
This is possible, but it comes at a high price. You'll have to set their AutoCheck property to false and take care of unchecking other buttons yourself. The most awkward thing that doesn't work right anymore is tab stops, a grouped set of buttons has only one tabstop but if you set AutoCheck = false then every button can be tabbed to.
The biggest problem no doubt it is the considerable confusion you'll impart on the user. So much so that you probably ought to consider checkboxes instead.
In windows forms I don't think there is an easy way (as in setting a property such as GroupName) to group radiobuttons. The quickest way would be to simply group the radiobuttons in a collection and listen to the checkedchanged event. For example:
var rbuttons = new List<RadioButton>{ radioButton1, radioButton2, radioButton3, radioButton4 }; //or get them dynamically..
rbuttons.ForEach(r => r.CheckedChanged += (o, e) =>
{
if (r.Checked) rbuttons.ForEach(rb => rb.Checked = rb == r);
});
If any of the radiobuttons in the list is checked, the others are automatically unchecked
I solved this by handling the CheckChanged event.
private void radio1_CheckedChanged(object sender, EventArgs e)
{
if (radio1.Checked)
{
// do stuff
radio2.Checked = false;
}
}
private void radio2_CheckedChanged(object sender, EventArgs e)
{
if (radio2.Checked)
{
// do stuff
radio1.Checked = false;
}
}
Related
I am currently working on a Editor, which lets the user design his own WinForm overlay, at least to a certain point.
Therefore I want the user to decide, which AnchorStyles the current selected Control should have. I would like it to be handled by checkboxes. Here's how I had it in mind:
As you can see, the user has currently selected a dynamically added Panel, called Grid. Handled by the CheckBoxes to the right, he should now be able to set the selected Controls AnchorStyles.
Here's my problem: I can't seem to find a usable solution, to dynamically add a specific AnchorStyle to the already existing ones, or the opposite, remove the AnchorStyle, but keep the other ones as they are.
I was trying to get it to work with...
SelectedControl.Anchor += AnchorStyles.Top;
which doesen't work at all. So i thought of this...
SelectedControl.Anchor = SelectedControl.Anchor | AnchorStyles.Top
which I imagine could work, but I haven't even tested it, since I wouldn't know how to remove ones unchecked AnchorStyle.
Building a gigantic if(){} else if(){}... doesen't seem to be a good Idea :)
I'm open for any ideas / solutions.
Thanks in advance!
Assuming you have four check box controls named top, bottom, left and right, you can handle CheckedChange event of them using a single method and set the anchor of the desired control based on the checked value of the controls. For example:
private void checkBox_CheckedChanged(object sender, EventArgs e)
{
var values = new[] { top.Checked, bottom.Checked, left.Checked, right.Checked };
byte[] data = new byte[1];
new BitArray(values).CopyTo(data, 0);
selectedControl.Anchor = (AnchorStyles)data[0];
}
Note: AnchorStyles is a flag enum having top=1, bottom=2, left=4 and right=8. Using above code I've mixed those flags to create the AnchorStyles and have assigned to the Anchor property of control.
I am facing an issue while running through all the User Controls in my Windows form.
I am creating a Windows Form that has the following features:
The Main form has 3 User Controls embedded in it
The Main form also has a combo box. Selecting a particular value in the Combo box will bring the corresponding User Control to the front.
Each User Control has two Check boxes as well as two Combo boxes.
The User can summon each User Control through the Main Form's combo box and check the check boxes and/or modify the combo boxes inside each User Control
Once this is done, there is a button, which on being pressed, executes the following code. This code is supposed to check which check boxes have been checked from every User Control, and execute some functionality :
private void button1_Click(object sender, EventArgs e)
{
foreach (Control c in this.Controls)
{
if (c is UserControl)
{
foreach (Control ctl in c.Controls)
{
if (ctl is CheckBox && (ctl as CheckBox).Checked)
{
Indicator.Text = "It's in";
}
}
}
}
//Some other code after this
}
Here, I have included a Text Box called "Indicator" that shows whether the compiler has entered a particular "for" loop or "if" block. And I'm observing that the innermost "if" alone is not getting executed.
Could someone point out why exactly this is happening?
You need a recursive algorithm,
void ProcessControls(Control ctrlContainer)
{
foreach (Control ctrl in ctrlContainer.Controls)
{
if (ctrl is CheckBox && (ctrl as CheckBox).Checked)
{
Indicator.Text = "It's in";
}
if (ctrl.HasChildren)
ProcessControls(ctrl);
}
}
I do think you might be better off adding some functionality to your user control so it can describe the state of its own checkboxes rather than going digging inside it to find it and do logic. Generally in OO programming, when we encapsulate things within a class, we also provide general purpose accessors "visible to the outside" to describe the internal state of affairs, rather than letting external code interests go poking around inside class to find out what they want
At some point in time you've added these usercontrols to the form either directly in the designer, or programmatically. In the first case they will have their own name:
var u1 = usercontrol1.GetCheckboxStateArray();
var u2 = usercontrol2.GetCheckboxStateArray();
Etc
Or maybe you added them programmatically, in which case it would make sense to keep track of them in a list as you're adding them:
protected List<UserControl> _ucList = new List<UserControl>();
...
foreach(var result in somedatabasequery){
var uc = new UserControl(result.Whatever);
this.Controls.Add(uc);
_ucList.Add(uc);
}
Then this list can be iterated. Sure you could argue that "well .Controls is a collection too, so why add them to another list when they're already in an accessible collection" - for the reasons you're here; .Controls is a general purpose description of the hierarchy of all controls on a form, it contains stuff we don't want and is hard to iterate. This List is purely and simply all and only the stuff we're interested in
As an aside, the UI you have described is atypical. The more usual way of hiding and showing controls under the selection of something that holds a bit of text would be a TabControl. It might be easier to loop through too, if you will persist with this "search for UserControls in a collection of controls" method - tabcontrols have tabpages, tabpages would probably have a .Controls that just contains your UserControl. The tabpage intrinsically takes care of showing and hiding controls as pages are clicked on which could simplify your code
Thanks to everyone for the answers. As it happens, the issue was hiding in plain sight, right under my nose. In each of the User Controls, I had placed the Checkboxes and Combo Boxes inside a Group Box. It completely slipped my mind, so much so that I didn't even mention them in my question.
Thus, as #Caius had suggested in the comments, the code wasn't functioning because I had not addressed the Group Box Container holding these Controls. Once I removed the Group Boxes (used only for aesthetic purpose), the code started functioning properly.
i'm developing a windows form application.in the form, the left part is a tree menu, and the right part is show area. how can i change the show area according to what i click on the tree menu.
(source: 126.net)
i use treenode class to implement treemenu like this:
System.Windows.Forms.TreeNode treeNode27 = new System.Windows.Forms.TreeNode("basic operation");
what i try to do is use several panels. each panel bounds to a menu item. by setting the visible property, i can achieve that goal. but it is too inconvenient.especially when i try to design each panel.
any good suggestion?
You could design each "Panel" as a new User Control. That way you can design all of the "panels / areas" on their own, independently of the Main Form.
On your Main Form, create a single panel for the right hand side area and add all of the controls to that one panel.
Then when the TreeNode selection event happens you can set all the user controls to .Visible = false; except for the one you are showing and set that to .Visible = true; and .Dock = DockStyle.Fill;
What you need is an event handler that will be called at the time of the user clicking the treeview (Use TreeView from the toolBox). You can do that by selecting the treeview on the design page and under properties click on Events. Then select NodeMouseDoubleClick or NodeMouseClick depending upon what you want. Below is a code that captures the values selected...Enjoy...;)
private void treeView1_NodeMouseDoubleClick(object sender, TreeNodeMouseClickEventArgs e)
{
if (treeView1.SelectedNode.Level == 2)
{
//text on the first level
string text = treeView1.SelectedNode.Text;
}
else if (treeView1.SelectedNode.Level == 1)
{
//text on the second level
string text = treeView1.SelectedNode.Text;
}
}
I know that the question might seems to easy, but I can't find solution. I have CheckdListBox in my form. I have list of checkboxes inside. If I do that:clbxMyControl.Enabled = false; then I can't scroll to see all items. How to allow scrolling on disabled CheckedListBox?
Thanks!
Instead of disabling the control you should change it's SelectionMode like this:
checkedListBox1.SelectionMode = SelectionMode.None;
The user won't be able to select an item but will be allowed to scroll
You can prevent the user from checking items with the ItemCheck event:
bool listEnabled = true;
private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e) {
if (!listEnabled) e.NewValue = e.CurrentValue;
}
But do make sure that it is obvious that checking no longer works:
private void setListEnabled(bool enabled) {
listEnabled = enabled;
if (listEnabled) checkedListBox1.BackColor = Color.FromKnownColor(KnownColor.Window);
else checkedListBox1.BackColor = Color.FromKnownColor(KnownColor.Control);
}
The ListBox has only one handle in the Windows API which is set to enabled or disabled. Therefore there is no native way to enable the scrolling but the items.
You might be able to build your own control that has the requested behavior but you will have to paint it your self from scratch which might be a lot of work or you find a third party control that supports the behavior.
Or you can not use the enabled property but change the background/font color to make it look disabled and set:
checkedListBox1.SelectionMode = SelectionMode.None;
Another alternative might be the DataGridView. It is much more powerful, I'm not sure if it disables the scrollbar, too but if it does you are able to make the cells readonly and color them.
You can use this code to make CheckedListBox scrollable.
clbxMyControl.SelectionMode = SelectionMode.None;
Because Enable=false; make control unscrollable because this make the container of checkbox disabled.
I have been asked to write c# winforms app that will give users the ability to select options from a checkbox list and have it automatically redraw/repaint a toolstrip with the selected items.
I am new to winforms so I am not sure how to approach it. Should I be using the BackgroundWorker Process? Invalidate()?
Just alittle confused.
Any assistence of pointing in the right direction would be appreciated.
You probably don't want a BackgroundWorker as that's run on a non-UI thread and would cause problems when you try to modify the toolstrip (you can only work with the UI on the thread the UI was created on). Handle the CheckedChanged events on the checkboxes and then add or remove items from the toolstrip. The repainting should be automatic.
You need to keep tooltips for all options some where (if Tag property of checkboxes is free the put it there). Then when an option is selected or deselected, you need to update tooltips.
Let's suppose you are adding all the checkboxes in a IList. then things will work as follows:
private IList<CheckBox> options= new List<CheckBox>();
private void UpdateTTip()
{
toolTip1.RemoveAll();
foreach (CheckBox c in options)
{
if (c.Checked)
toolTip1.SetToolTip(c, c.Tag.ToString());
}
}
Now you need to call this on checkedchanged event of options check boxes:
private void chk_CheckedChanged(object sender, EventArgs e)
{
UpdateTTip();
}
A toolstrip contains controls by itself - it does not just "paint" buttons you can press. In order to have the toolstrip display different buttons depending on different conditions, you can:
Clear the toolstrip items and re-create the ones that are needed in the current context in code when items are checked in the list you mentioned
Add all the items and design time (with property Visible = false) and only set the necessary ones to Visible = true upon selection in your check listbox
No need to do any painting :-)