The problem i face is quite annoying.
I have a tabControl with the 2 tabItems(Home,Show)
The Home tab starts as Visible and Show as Hidden
In Home i have an image for which i handle the MouseLeftButtonDown event.
This event should change the visibility of Show TabItem and make it Selected.
At the code i have a tabControl.SelectedIndex = 1;
which forces the tabControl SelectionChangeEvent (which i use to change the foreground
of the Show and Home TabItems).
The problem i face is that instead of the focus to get passed to Show, it remains on Home.
I have no problem with the code, because at the last step of the SelectionChange event handler ,which is the last function that gets executed by my code, what i see in the ui is correct.
So what gets executed after that?
Can anybody help?
private void Main_clientImage_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
showMenu.Visibility = Visibility.Visible;
setTabSelected("showMenu");
}
public void setTabSelected(String name)
{
for (int i = 0; i tabControl.Items.Count ; i++)
{
TabItem item = tabControl.Items.GetItemAt(i) as TabItem;
if (item.Name.Equals(name))
{
selectedTab=i;
tabControl.SelectedIndex = i;
item.Foreground = new SolidColorBrush(Colors.Black);
}
else
{
item.Foreground = new SolidColorBrush(Colors.White);
}
}
}
private void tabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
for (int i = 0; i tabControl.Items.Count; i++)
{
TabItem item = tabControl.Items.GetItemAt(i) as TabItem;
if (tabControl.SelectedIndex == i)
{
item.Foreground = new SolidColorBrush(Colors.Black);
}
else
{
item.Foreground = new SolidColorBrush(Colors.White);
}
}
}
//EDIT: I solved it by adding a simple e.Handler = true at MouseLeftButtonDown event.
Whats wrong with this thing???
I changed the SelectedItem of TabControl in a method
void open_Click(object sender, RoutedEventArgs e)
and did it from a <Button Click="open_Click" and from a <DataGrid MouseDoubleClick="open_Click".
Only by adding
e.Handled = true;
at the end of in method open_Click it worked for the MouseDoubleClick as Fotis mentioned in the question.
There is problem with your code.
private void Main_clientImage_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
showMenu.Visibility = Visibility.Visible;
homeMenu.Visibility = Visibility.Hidden;
setTabSelected("showMenu");
}
public void setTabSelected(String name)
{
for (int i = 0; i < tabControl.Items.Count; i++)
{
TabItem item = tabControl.Items.GetItemAt(i) as TabItem;
if (item.Header.Equals(name))
{
selectedTab = i;
item.IsSelected = true;
item.Foreground = new SolidColorBrush(Colors.Black);
}
else
{
item.Foreground = new SolidColorBrush(Colors.White);
}
}
}
private void tabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
for (int i = 0; i < tabControl.Items.Count; i++)
{
TabItem item = tabControl.Items.GetItemAt(i) as TabItem;
if (tabControl.SelectedIndex == i)
{
item.Foreground = new SolidColorBrush(Colors.Black);
}
else
{
item.Foreground = new SolidColorBrush(Colors.White);
}
}
}
In the above code I am checking item.Header.Equals(name) and set item.IsSelected = true. Sometimes selectionindex doesn't work properly. The above code should address your problem.
After the SelectedItem property of the TabControl has changed, you need to make sure that SelectedItem.IsFocused = true. If not just use SelectedItem.Focus() right after you changed the SelectedItem property. It helped in my case.
Related
I have added splitcontainer in a form for my application. Basically, I have multiple buttons in left panel, each having drop down menu items added dynamically. When an item is clicked, it brings a common form with updated values(in labels) in right panel. It works fine for the first time when a menu item is clicked.But in the next click of another menu item, brings out the old form details which should be giving a form with updated label values.The issue I am having is that the form is not updating label values. I couldn't find much about this issue online.Any help would be much appreciated.
Splitcontainer form;
public int lightIndex
{
get { return _lightindex; }
set { _lightindex = value; }
}
public int groupIndex
{
get { return _groupindex; }
set { _groupindex = value; }
}
Button click event
private void button_Click(object sender, EventArgs e)
{
Button btnSender = (Button)sender;
groupIndex = groupbuttons.IndexOf((Button)sender);
ContextMenu cm = new ContextMenu();
List<UserLight> alllight = Global.g_userlightgroups[_groupindex].getUserlights();
for (int i = 0; i < alllight.Count(); i++)
{
ContextMenu = cm;
MenuItem item = new MenuItem(alllight[i].getlightType().ToString());
item.Click += Item_Click;
cm.MenuItems.Add(item);
}
Point ptLowerLeft = new Point(0, btnSender.Height);
ptLowerLeft = btnSender.PointToScreen(ptLowerLeft);
cm.Show(btnSender, ptLowerLeft);
}
private void Item_Click(object sender, EventArgs e )
{
MenuItem menuItem = (MenuItem)sender;
String lighttype = menuItem.Text;
if (lighttype.Equals("PRIMITIVE"))
{
PrimitiveLight prim = new PrimitiveLight();
prim.TopLevel = false;
prim.Parent = lightcontainer.Panel2;
prim.groupIndex = _groupindex;
prim.lightIndex = menuItem.Index;
prim.Show();
prim.Dock = DockStyle.Fill;
}
}
PrimitiveLight form: This form will be inserted into splitcontainer panel2 when menu item is clicked.
private int _lightindex;
private int _groupindex;
public int lightIndex
{
get { return _lightindex; }
set { _lightindex = value; }
}
public int groupIndex
{
get { return _groupindex; }
set { _groupindex = value; }
}
private void PrimitiveLight_Load(object sender, EventArgs e)
{
lightDefname.Text = Global.g_userlightgroups[_groupindex].getUserlights().ElementAt(_lightindex).getdefName().ToString();
lightCustname.Text = Global.g_userlightgroups[_groupindex].getUserlights().ElementAt(_lightindex).getcustName().ToString();
}
panel2.Refresh() Maybe, dont know your issue but you can refresh the panel.
Let's say I have a ListView on a form and it is populated with records.
How can I do this : when I click (single click) on a row , something has to happen - for example MessageBox.Show("row selected");
How to make this happen? Do I need a mouse click event ? And how can I do this?
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
var selectedItemText = (listBox1.SelectedItem ?? "(none)").ToString();
MessageBox.Show("Selected: " + selectedItemText);
}
private void listBox1_MouseClick(object sender, MouseEventArgs e)
{
for (int i = 0; i < listBox1.Items.Count; i++)
{
var rectangle = listBox1.GetItemRectangle(i);
if (rectangle.Contains(e.Location))
{
MessageBox.Show("Item " + i);
return;
}
}
MessageBox.Show("None");
}
#Tommy answer is for ListBox, this one is for ListView :
private void listView1_MouseClick(object sender, MouseEventArgs e)
{
for (int i = 0; i < listView1.Items.Count; i++)
{
var rectangle = listView1.GetItemRect(i);
if (rectangle.Contains(e.Location))
{
//Write your code here
return;
}
}
}
To prevent unwished behavior on ListView with checkboxes my solution is:
private void lvMembers_MouseClick(object sender, MouseEventArgs e)
{
for (int itemIndex = 0; itemIndex < lvMembers.Items.Count; itemIndex++)
{
ListViewItem item = lvMembers.Items[itemIndex];
Rectangle itemRect = item.GetBounds(ItemBoundsPortion.Label);
if (itemRect.Contains(e.Location))
{
item.Checked = !item.Checked;
break;
}
}
}
If you want to select listview item on mouse click over it try this.
private void timeTable_listView_MouseUp(object sender, MouseEventArgs e)
{
Point mousePos = timeTable_listView.PointToClient(Control.MousePosition);
ListViewHitTestInfo hitTest = timeTable_listView.HitTest(mousePos);
try
{
int columnIndex = hitTest.Item.SubItems.IndexOf(hitTest.SubItem);
edit_textBox.Text = timeTable_listView.SelectedItems[0].SubItems[columnIndex].Text;
}
catch(Exception)
{
}
}
I have a CheckedListBox with 10 items. On each item check a method is being called. I want to disable the checkbox of that particular item for which the method is being executed so that user cannot uncheck the item till the job is completed.
Note: Unchecking of an item calls another method.
Here is the code of ItemCheck Event:
private void host_listbox_ItemCheck(object sender, ItemCheckEventArgs e)
{
int index = e.Index;
try
{
string sitem = host_listbox.Items[index].ToString();
host_list[sitem].checked_event=e;
if (!host_list[sitem].is_busy)
{
host_config.listEnabled = false;
host_list[sitem].con_worker.RunWorkerAsync();
}
if (host_listbox.GetItemCheckState(index) == CheckState.Checked)
{
host_list[sitem].connected = false;
}
}
catch(Exception ex)
{
output_textbox.AppendText("connection failed!" +ex.ToString() +Environment.NewLine);
}
}
You can check/uncheck items in your checkedListBox with this code
checkedListBox.SetItemChecked(item, true);
for more informations go to microsoft documentation
private void host_listbox_ItemCheck(object sender, ItemCheckEventArgs e)
{
int index = e.Index;
try
{
string sitem = host_listbox.Items[index].ToString();
if (host_list[sitem].is_busy // or whatever indicates that background worker is running or any condition that specifies, that you do not want to let this item to be changed)
e.NewValue = e.CurrentValue; //Change the value back
else
{
//Let the checked state of the item change
This code prevent checked state change if associated background work is running:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
workerList = new List<BackgroundWorker>();
for (int i = 0; i < 10; i++)
{
var el = new BackgroundWorker();
el.DoWork += (s, e) =>
{
Thread.Sleep(5000);
};
workerList.Add(el);
checkedListBox1.Items.Add("el " + i);
}
}
private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)
{
var worker = workerList[e.Index];
if (worker.IsBusy)
{
e.NewValue = e.CurrentValue;
return;
}
if (e.NewValue == CheckState.Checked)
worker.RunWorkerAsync();
}
public List<BackgroundWorker> workerList { get; set; }
}
Think, that only funcion solution is set selection mode
CheckedListBox.SelectionMode = SelectionMode.None;
private void ItemCheck(object sender, ItemCheckEventArgs e)
{
if (busy)
e.NewValue = e.CurrentValue;
}
I have a custom control containing a button with a label underneath. I want to make these controls to be draggable over another one to arrange them as I want in a flowlayoutpanel.
Now is working only if I drag the control from it's background (marked with yellow in the picture bellow) to the other control's yellow marked area, but not if i drag from the button or label area..
How can I make it so I can move the custom control no matter from where I grab and drop it on the other control. Basically to be only one control not like a container for the button and label..
This is my code so far:
private void flowLayoutPanel1_DragEnter(object sender, DragEventArgs e)
{
e.Effect = DragDropEffects.Move;
}
private void flowLayoutPanel1_DragDrop(object sender, DragEventArgs e)
{
CustomControl target = sender as CustomControl;
if (target != null)
{
int targetIndex = FindCSTIndex(target);
if (targetIndex != -1)
{
string pictureBoxFormat = typeof(CustomControl).FullName;
if (e.Data.GetDataPresent(pictureBoxFormat))
{
CustomControl source = e.Data.GetData(pictureBoxFormat) as CustomControl;
int sourceIndex = this.FindCSTIndex(source);
if (targetIndex != -1)
this.flowLayoutPanel1.Controls.SetChildIndex(source, targetIndex);
}
}
}
}
private int FindCSTIndex(CustomControl cst_ctr)
{
for (int i = 0; i < this.flowLayoutPanel1.Controls.Count; i++)
{
CustomControl target = this.flowLayoutPanel1.Controls[i] as CustomControl;
if (cst_ctr == target)
return i;
}
return -1;
}
private void OnCstMouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
CustomControl cst = sender as CustomControl;
cst.DoDragDrop(cst, DragDropEffects.Move);
}
}
And the custom control class:
public class CustomControl : Control
{
private Button _button;
private Label _label;
public CustomControl(Button button, Label label)
{
_button = button;
_label = label;
button.Width = 50;
button.Height = 50;
label.Width = 65;
button.BackgroundImageLayout = ImageLayout.Stretch;
Height = button.Height + label.Height;
Width = 68;
// Width = Math.Max(button.Width, label.Width);
Controls.Add(_button);
_button.Location = new Point(0, 0);
Controls.Add(_label);
_label.Location = new Point(0, button.Height);
}
}
Use MouseDown instead of MouseMove to initiate drag-and-drop (MSDN). You can initiate drag-and-drop in the control code itself (assuming what all CustomControls will be drag-and-drop-able), otherwise you may want to create public method to sign childs (exposing childs is bad idea, unless you already use them outside).
public class CustomControl : Control
{
...
public CustomControl(Button button, Label label)
{
...
_button.MouseDown += OnMouseDown;
_label.MouseDown += OnMouseDown;
}
override void OnMouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
(sender as Control).DoDragDrop(this, DragDropEffects.Move);
}
}
Untested, but should give you idea.
Managed to solve it:
private void flowLayoutPanel1_DragDrop(object sender, DragEventArgs e)
{
Control target = new Control();
target.Parent = sender as Control;
if (target != null)
{
int targetIndex = FindCSTIndex(target.Parent);
if (targetIndex != -1)
{
string cst_ctrl = typeof(CustomControl).FullName;
if (e.Data.GetDataPresent(cst_ctrl))
{
Button source = new Button();
source.Parent = e.Data.GetData(cst_ctrl) as CustomControl;
if (targetIndex != -1)
this.flowLayoutPanel1.Controls.SetChildIndex(source.Parent, targetIndex);
}
}
}
}
private int FindCSTIndex(Control cst_ctr)
{
for (int i = 0; i < this.flowLayoutPanel1.Controls.Count; i++)
{
CustomControl target = this.flowLayoutPanel1.Controls[i] as CustomControl;
if (cst_ctr.Parent == target)
return i;
}
return -1;
}
private void OnCstMouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
Control cst = sender as Control;
cst.DoDragDrop(cst.Parent, DragDropEffects.Move);
}
}
Is it possible to reorder the tabs in the WinForms TabControl at run-time like IE or Firefox?
Links like this don't give me much hope.
Sure, it's possible! You're most likely trying to overcomplicate the solution. Essentially, all you have to do is subclass the standard TabControl and add some logic to the mouse event handlers. You'll just need to check which form the user is currently dragging and reorder it in the TabPages collection.
There are a couple of complete solutions available online:
Reordering TabPages inside TabControl
Drag and Drop Tab Control
Reposition TabItems at runtime
I found the solution originally posted by #Cody Gray to be mostly what I wanted, but I didn't see the need for it to be so complicated.
This is my simplification, implemented by deriving from TabControl:
public class DraggableTabControl : TabControl
{
private TabPage m_DraggedTab;
public DraggableTabControl()
{
MouseDown += OnMouseDown;
MouseMove += OnMouseMove;
}
private void OnMouseDown(object sender, MouseEventArgs e)
{
m_DraggedTab = TabAt(e.Location);
}
private void OnMouseMove(object sender, MouseEventArgs e)
{
if (e.Button != MouseButtons.Left || m_DraggedTab == null)
{
return;
}
TabPage tab = TabAt(e.Location);
if (tab == null || tab == m_DraggedTab)
{
return;
}
Swap(m_DraggedTab, tab);
SelectedTab = m_DraggedTab;
}
private TabPage TabAt(Point position)
{
int count = TabCount;
for (int i = 0; i < count; i++)
{
if (GetTabRect(i).Contains(position))
{
return TabPages[i];
}
}
return null;
}
private void Swap(TabPage a, TabPage b)
{
int i = TabPages.IndexOf(a);
int j = TabPages.IndexOf(b);
TabPages[i] = b;
TabPages[j] = a;
}
}
The drag and drop APIs are really intended for dragging stuff between separate applications, or at the very least, separate controls. Using them in this case is overkill.
Make sure you upvote Cody's answer too if you upvote mine, as it is based on his.
reordering TabPages with drag and drop - by Ludwig B.
inspired by http://dotnetrix.co.uk/tabcontrol.htm#tip7
private void tc_MouseDown(object sender, MouseEventArgs e)
{
// store clicked tab
TabControl tc = (TabControl)sender;
int hover_index = this.getHoverTabIndex(tc);
if (hover_index >= 0) { tc.Tag = tc.TabPages[hover_index]; }
}
private void tc_MouseUp(object sender, MouseEventArgs e)
{
// clear stored tab
TabControl tc = (TabControl)sender;
tc.Tag = null;
}
private void tc_MouseMove(object sender, MouseEventArgs e)
{
// mouse button down? tab was clicked?
TabControl tc = (TabControl)sender;
if ((e.Button != MouseButtons.Left) || (tc.Tag == null)) return;
TabPage clickedTab = (TabPage)tc.Tag;
int clicked_index = tc.TabPages.IndexOf(clickedTab);
// start drag n drop
tc.DoDragDrop(clickedTab, DragDropEffects.All);
}
private void tc_DragOver(object sender, DragEventArgs e)
{
TabControl tc = (TabControl)sender;
// a tab is draged?
if (e.Data.GetData(typeof(TabPage)) == null) return;
TabPage dragTab = (TabPage)e.Data.GetData(typeof(TabPage));
int dragTab_index = tc.TabPages.IndexOf(dragTab);
// hover over a tab?
int hoverTab_index = this.getHoverTabIndex(tc);
if (hoverTab_index < 0) { e.Effect = DragDropEffects.None; return; }
TabPage hoverTab = tc.TabPages[hoverTab_index];
e.Effect = DragDropEffects.Move;
// start of drag?
if (dragTab == hoverTab) return;
// swap dragTab & hoverTab - avoids toggeling
Rectangle dragTabRect = tc.GetTabRect(dragTab_index);
Rectangle hoverTabRect = tc.GetTabRect(hoverTab_index);
if (dragTabRect.Width < hoverTabRect.Width)
{
Point tcLocation = tc.PointToScreen(tc.Location);
if (dragTab_index < hoverTab_index)
{
if ((e.X - tcLocation.X) > ((hoverTabRect.X + hoverTabRect.Width) - dragTabRect.Width))
this.swapTabPages(tc, dragTab, hoverTab);
}
else if (dragTab_index > hoverTab_index)
{
if ((e.X - tcLocation.X) < (hoverTabRect.X + dragTabRect.Width))
this.swapTabPages(tc, dragTab, hoverTab);
}
}
else this.swapTabPages(tc, dragTab, hoverTab);
// select new pos of dragTab
tc.SelectedIndex = tc.TabPages.IndexOf(dragTab);
}
private int getHoverTabIndex(TabControl tc)
{
for (int i = 0; i < tc.TabPages.Count; i++)
{
if (tc.GetTabRect(i).Contains(tc.PointToClient(Cursor.Position)))
return i;
}
return -1;
}
private void swapTabPages(TabControl tc, TabPage src, TabPage dst)
{
int index_src = tc.TabPages.IndexOf(src);
int index_dst = tc.TabPages.IndexOf(dst);
tc.TabPages[index_dst] = src;
tc.TabPages[index_src] = dst;
tc.Refresh();
}
I extended the answer of Jacob Stanley a bit. This way the swapping won't occur too often. This is especially helpful for tabs of different sizes in which case the previous solution would swap very often while dragging.
The difference in user experience is that you have to drag a bit further to actually move the tab. But this is similar to tab reordering in browsers.
Also I added a hand cursor while dragging and enabled double-buffering.
using System;
using System.Drawing;
using System.Windows.Forms;
namespace Controls
{
public class DraggableTabControl : TabControl
{
private TabPage draggedTab;
public DraggableTabControl()
{
this.MouseDown += OnMouseDown;
this.MouseMove += OnMouseMove;
this.Leave += new System.EventHandler(this.DraggableTabControl_Leave);
this.SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint, true);
}
private void OnMouseDown(object sender, MouseEventArgs e)
{
draggedTab = TabAt(e.Location);
}
private void OnMouseMove(object sender, MouseEventArgs e)
{
if (e.Button != MouseButtons.Left || draggedTab == null)
{
this.Cursor = this.DefaultCursor;
draggedTab = null;
return;
}
int index = TabPages.IndexOf(draggedTab);
int nextIndex = index + 1;
int prevIndex = index - 1;
int minXForNext = int.MaxValue;
int maxXForPrev = int.MinValue;
var tabRect = GetTabRect(index);
if (nextIndex < TabPages.Count)
{
var nextTabRect = GetTabRect(nextIndex);
minXForNext = tabRect.Left + nextTabRect.Width;
}
if (prevIndex >= 0)
{
var prevTabRect = GetTabRect(prevIndex);
maxXForPrev = prevTabRect.Left + tabRect.Width;
}
this.Cursor = Cursors.Hand;
if (e.Location.X > maxXForPrev && e.Location.X < minXForNext)
{
return;
}
TabPage tab = TabAt(e.Location);
if (tab == null || tab == draggedTab)
{
return;
}
Swap(draggedTab, tab);
SelectedTab = draggedTab;
}
private TabPage TabAt(Point position)
{
int count = TabCount;
for (int i = 0; i < count; i++)
{
if (GetTabRect(i).Contains(position))
{
return TabPages[i];
}
}
return null;
}
private void Swap(TabPage a, TabPage b)
{
int i = TabPages.IndexOf(a);
int j = TabPages.IndexOf(b);
TabPages[i] = b;
TabPages[j] = a;
}
private void DraggableTabControl_Leave(object sender, EventArgs e)
{
this.Cursor = this.DefaultCursor;
draggedTab = null;
}
}
}