please for a little help in displaying the panel at the click of a button, namely in my application I have a FormMenu in which the panelCentralForm is displayed when loading.
When I click on btnListOfActiveUser_Click I manage to open FormListStaff over panelCentralForm using this code:
private void btnListOfActiveUser_Click(object sender, EventArgs e)
{
FormListStaff formListStaff = new FormListStaff();
AddFormToPanel(formListStaff);
}
private void AddFormToPanel(object form)
{
if (this.panelCentralForm.Controls.Count > 0)
this.panelCentralForm.Controls.RemoveAt(0);
Form fh = form as Form;
fh.TopLevel = false;
fh.FormBorderStyle = FormBorderStyle.None;
fh.Dock = DockStyle.Fill;
this.panelCentralForm.Controls.Add(fh);
this.panelCentralForm.Tag = fh;
fh.Show();
}
my question is how can I in a similar way that now when I click on buttonDashboard to return to me the first view, ie the view from the Central Form panel (panelCentralForm).
private void buttonDashboard_Click(object sender, EventArgs e)
{
panelCentralForm.Visible = true; //something like this, p.s. this code doesn't just work as an example I wrote
}
the whole view belongs from FormMenu.cs
Thanks a lot to everyone for the help
my question is how can I in a similar way that now when I click on
buttonDashboard to return to me the first view
Just Clear() the panel, then add the label back in?
this.panelCentralForm.Controls.Clear();
this.panelCentralForm.Controls.Add(label1);
The label should still be accessible even though it was previously removed from the panel since it is declared at form level in your designer file.
Basically, I am using mediaplayerelement, and with CustomMediaTransportControls with some custom buttons, I have one issue need to solve:
The media is set to autoplay, so when source is set, the playing starts, when pause button is clicked, the playing pauses, and the button changes to play state, now when play button is clicked, I want add a function before the playing starts, to first refresh and get a new source then play.
I really don't want to create my own media control if possible, so basically using build in transport control, just some how override playbutton_click, is this doable?
Use PlaybackStateChanged event and check for PlaybackState
public MainPage()
{
this.InitializeComponent();
MediaPlayerElementName.MediaPlayer.PlaybackSession.PlaybackStateChanged += PlaybackSession_PlaybackStateChanged;
}
bool isFirst = true;
private void PlaybackSession_PlaybackStateChanged(MediaPlaybackSession sender, object args)
{
if (sender.PlaybackState == MediaPlaybackState.Playing)
{
if (!isFirst)
{
//Set your New source
isFirst = true;
}
else
isFirst = false;
}
}
here i have this problem with popup window, i popup an usercontrol in a dll and call this dll in an app, but it shows upon a black page that i have no idear where its from. when i push the '<-' button ,the app directly exit... i can't go back to the app's mainpage where calls it.
I wonder how can I return from the popup window. I tried to hide the popup window, but it doesn't go back to app's mainpage.
public void change_PIN(OnCCB_ChangeUserPINCall changeUserPINCall)
{
Popup ppChangePIN = new Popup();
ChangePIN changePIN = new ChangePIN();
ppChangePIN.Child = changePIN;
ppChangePIN.IsOpen = true;
}
How can I set ppChangePIN.IsOpen=false inside popup window .cs to make it disappear?
Handle back key press event of back button like
step1: first set one flag when popup is open like **bool PopupOpen=True**
step2: When popup is close at that time PopupOpen=False
protected override void OnBackKeyPress(System.ComponentModel.CancelEventArgs e)
{
if(PopupOpen== True)
{
ppChangePIN.IsOpen=false;
PopupOpen=False;
e.Cancel = true;
}
else
{}
}
If any query let me know...
hope it work for you
private bool RemovePopup()
{
if (ppChangePIN == null || !ppChangePIN.IsOpen)
return false;
ppChangePIN.IsOpen = false;
return true;
}
protected override void OnBackKeyPress(CancelEventArgs e)
{
if (RemovePopup())
e.Cancel = true;
}
I have no better way of explaining it, but I want to implement a container that only is shown after the user clicked "Advanced" or a plus sign somewhere in the dialog. I have a login form and want to add some "Advanced" settings. But they should normally out of view.
Of course, the dialog has to resize nicely to hold the extended content.
How should I go to implement such a thing. I have tried some Google searches, but can't find the right search words. Windows doesn't seem to have it by default.
as John Willemse suggested, I ended up creating the functionality myself. I added a Panel in the form that I just set visible or invisible.
In the Form's constructor (to hide it on first view):
public FrmLogin() {
InitializeComponent();
pnlAdvanced.Visible = false;
Height -= pnlAdvanced.Height;
}
Then, I added a LinkLabel with this Clicked handler:
private void linkLabel1_LinkClicked(object sender,
LinkLabelLinkClickedEventArgs e) {
if (pnlAdvanced.Visible == false) {
Height += pnlAdvanced.Height;
pnlAdvanced.Visible = true;
} else {
Height -= pnlAdvanced.Height;
pnlAdvanced.Visible = false;
}
}
Works perfectly and no extra code needed.
Is there a way to disable a tab in a TabControl?
Cast your TabPage to a Control, then set the Enabled property to false.
((Control)this.tabPage).Enabled = false;
Therefore, the tabpage's header will still be enabled but its contents will be disabled.
The TabPage class hides the Enabled property. That was intentional as there is an awkward UI design problem with it. The basic issue is that disabling the page does not also disable the tab. And if try to work around that by disabling the tab with the Selecting event then it does not work when the TabControl has only one page.
If these usability problems do not concern you then keep in mind that the property still works, it is merely hidden from IntelliSense. If the FUD is uncomfortable then you can simply do this:
public static void EnableTab(TabPage page, bool enable) {
foreach (Control ctl in page.Controls) ctl.Enabled = enable;
}
You can simply use:
tabPage.Enabled = false;
This property is not shown, but it works without any problems.
You can program the Selecting event on TabControler to make it impossible to change to a non-editable tab:
private void tabControler_Selecting(object sender, TabControlCancelEventArgs e)
{
if (e.TabPageIndex < 0) return;
e.Cancel = !e.TabPage.Enabled;
}
You could register the "Selecting" event and cancel the navigation to the tab page:
private void tabControl1_Selecting(object sender, TabControlCancelEventArgs e)
{
if (e.TabPage == tabPage2)
e.Cancel = true;
}
Another idea is to put all the controls on the tabpage in a Panel control and disable the panel! Smiley
You could also remove the tabpage from the tabControl1.TabPages collection. That would hide the tabpage.
Credits go to littleguru # Channel 9.
Presumably, you want to see the tab in the tab control, but you want it to be "disabled" (i.e., greyed, and unselectable). There is no built-in support for this, but you can override the drawing mechanism to give the desired effect.
An example of how to do this is provided here.
The magic is in this snippet from the presented source, and in the DisableTab_DrawItem method:
this.tabControl1.DrawMode = TabDrawMode.OwnerDrawFixed;
this.tabControl1.DrawItem += new DrawItemEventHandler( DisableTab_DrawItem );
Extending upon Cédric Guillemette answer, after you disable the Control:
((Control)this.tabPage).Enabled = false;
...you may then handle the TabControl's Selecting event as:
private void tabControl_Selecting(object sender, TabControlCancelEventArgs e)
{
e.Cancel = !((Control)e.TabPage).Enabled;
}
This will remove the tab page, but you'll need to re-add it when you need it:
tabControl1.Controls.Remove(tabPage2);
If you are going to need it later, you might want to store it in a temporary tabpage before the remove and then re-add it when needed.
The only way is to catch the Selecting event and prevent a tab from being activated.
The most tricky way is to make its parent equals null (make the tab alone without parent):
tabPage.Parent = null;
And when you want to return it back (will return it back at the end of pages collection) :
tabPage.Parent = tabControl;
And if you want to return it back in a specific location among the pages you can use :
tabControl.TabPages.Insert(indexLocationYouWant, tabPage);
I had to handle this a while back. I removed the Tab from the TabPages collection (I think that's it) and added it back in when the conditions changed. But that was only in Winforms where I could keep the tab around until I needed it again.
I've removed tab pages in the past to prevent the user from clicking them. This probably isn't the best solution though because they may need to see that the tab page exists.
Using events, and the properties of the tab control you can enable/disable what you want when you want. I used one bool that is available to all methods in the mdi child form class where the tabControl is being used.
Remember the selecting event fires every time any tab is clicked. For large numbers of tabs a "CASE" might be easier to use than a bunch of ifs.
public partial class Form2 : Form
{
bool formComplete = false;
public Form2()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
formComplete = true;
tabControl1.SelectTab(1);
}
private void tabControl1_Selecting(object sender, TabControlCancelEventArgs e)
{
if (tabControl1.SelectedTab == tabControl1.TabPages[1])
{
tabControl1.Enabled = false;
if (formComplete)
{
MessageBox.Show("You will be taken to next tab");
tabControl1.SelectTab(1);
}
else
{
MessageBox.Show("Try completing form first");
tabControl1.SelectTab(0);
}
tabControl1.Enabled = true;
}
}
}
I've solved this problem like this:
I've got 3 tabs and I want to keep user at the first tab if he didnt log in,
so on the SelectingEvent of TabControl I wrote
if (condition) { TabControl.Deselect("2ndPage"); TabControl.Deselect("3dPage"); }
The user cannot click on tabs to navigate, but they can use the two buttons (Next and Back). The user cannot continue to the next if the //conditions are no met.
private int currentTab = 0;
private void frmOneTimeEntry_Load(object sender, EventArgs e)
{
tabMenu.Selecting += new TabControlCancelEventHandler(tabMenu_Selecting);
}
private void tabMenu_Selecting(object sender, TabControlCancelEventArgs e)
{
tabMenu.SelectTab(currentTab);
}
private void btnNextStep_Click(object sender, EventArgs e)
{
switch(tabMenu.SelectedIndex)
{
case 0:
//if conditions met GoTo
case 2:
//if conditions met GoTo
case n:
//if conditions met GoTo
{
CanLeaveTab:
currentTab++;
tabMenu.SelectTab(tabMenu.SelectedIndex + 1);
if (tabMenu.SelectedIndex == 3)
btnNextStep.Enabled = false;
if (btnBackStep.Enabled == false)
btnBackStep.Enabled = true;
CannotLeaveTab:
;
}
private void btnBackStep_Click(object sender, EventArgs e)
{
currentTab--;
tabMenu.SelectTab(tabMenu.SelectedIndex - 1);
if (tabMenu.SelectedIndex == 0)
btnBackStep.Enabled = false;
if (btnNextStep.Enabled == false)
btnNextStep.Enabled = true;
}
tabControl.TabPages.Remove(tabPage1);
This is an old question, but someone may benefit from my addition. I needed a TabControl that would show hidden tabs successively (after an action was performed on the current tab). So, I made a quick class to inherit from and called HideSuccessive() on Load:
public class RevealingTabControl : TabControl
{
private Action _showNextRequested = delegate { };
public void HideSuccessive()
{
var tabPages = this.TabPages.Cast<TabPage>().Skip(1);
var queue = new ConcurrentQueue<TabPage>(tabPages);
tabPages.ToList().ForEach(t => t.Parent = null);
_showNextRequested = () =>
{
if (queue.TryDequeue(out TabPage tabPage))
tabPage.Parent = this;
};
}
public void ShowNext() => _showNextRequested();
}
There is the XtraTabPage.PageEnabled property allowing you to disable certain pages.
Here the solution that i implement:
private void switchTapPage(TabPage tabPage)
{
foreach(TabPage page in tabControl1.TabPages)
{
tabControl1.TabPages.Remove(page);
}
tabControl1.TabPages.Add(tabPage);
}
Basically, i just call this method sending the tabPage that i currently need to show, the method will remove all the tabPages on the tabControl and after that it will just add the one that i sent it.
So the rest of the tabHeaders will not shown and they will be inaccessible, because they dont even exists in the tabControl.
I took the idea from the #stormenet answer.
You can do it through the tabpages: tabPage1.Hide(), tabPage2.Show() etc.
In the form load event if we write this.tabpage.PageEnabled = false, the tabpage will be disabled.
Assume that you have these controls:
TabControl with name tcExemple.
TabPages with names tpEx1 and tpEx2.
Try it:
Set DrawMode of your TabPage to OwnerDrawFixed;
After InitializeComponent(), make sure that tpEx2 is not enable by adding this code:
((Control)tcExemple.TabPages["tpEx2").Enabled = false;
Add to Selection tcExemple event the code below:
private void tcExemple_Selecting(object sender, TabControlCancelEventArgs e)
{
if (!((Control)e.TabPage).Enabled)
{
e.Cancel = true;
}
}
Attach to DrawItem event of tcExemple this code:
private void tcExemple_DrawItem(object sender, DrawItemEventArgs e)
{
TabPage page = tcExemple.TabPages[e.Index];
if (!((Control)page).Enabled)
{
using (SolidBrush brush = new SolidBrush(SystemColors.GrayText))
{
e.Graphics.DrawString(page.Text, page.Font, brush, e.Bounds);
}
}
else
{
using (SolidBrush brush = new SolidBrush(page.ForeColor))
{
e.Graphics.DrawString(page.Text, page.Font, brush, e.Bounds);
}
}
}
It will make the second tab non-clickable.
I could not find an appropriate answer to the question. There looks to be no solution to disable the specific tab. What I did is to pass the specific tab to a variable and in SelectedIndexChanged event put it back to SelectedIndex:
//variable for your specific tab
int _TAB = 0;
//here you specify your tab that you want to expose
_TAB = 1;
tabHolder.SelectedIndex = _TAB;
private void tabHolder_SelectedIndexChanged(object sender, EventArgs e)
{
if (_TAB != 0) tabHolder.SelectedIndex = _TAB;
}
So, you don't actually disable the tab, but when another tab is clicked it always returns you to the selected tab.
in C# 7.0, there is a new feature called Pattern Matching. You can disable all tabs via Type Pattern.
foreach (Control control in Controls)
{
// the is expression tests the variable and
// assigned it to a new appropriate variable type
if (control is TabControl tabs)
{
tabs.Enabled = false;
}
}
Use:
tabControl1.TabPages[1].Enabled = false;
By writing this code, the tab page won't be completely disabled (not being able to select), but its internal content will be disabled which I think satisfy your needs.
The solution is very simple.
Remove/comment this line
this.tabControl.Controls.Add(this.YourTabName);
in IntializeComponent() method in MainForm.cs
MyTabControl.SelectedTab.Enabled = false;