I am using Combo box while creating Desktop Application using C# in Visual Studio, I increased the font size to "20" now when I run the application and click the dropdown button list elements font-size also increased.
That's fine. But, when I write something in the combo box it gives suggestions as shown in the picture below.
I, also want to increase the font size of this suggestion list, I have set "AutoCompleteMode" property set to "suggest". Is anybody can help me with this?
The font of the auto-complete text presented is fixed. There is no corresponding properties to set it.
A workaround is that you can create a custom control and replace the suggest-drop-down with custom listbox.
public Form1()
{
InitializeComponent();
comboBox1.Size = new Size(120, 30);
listBox.SelectedIndexChanged += ListBox_SelectedIndexChanged;
}
private void ListBox_SelectedIndexChanged(object sender, EventArgs e)
{
comboBox1.Text = listBox.Text;
listBox.Visible = false;
}
ListBox listBox = new ListBox();
// event triggered when the user enters text
private void comboBox1_TextUpdate(object sender, EventArgs e)
{
// set the font of listbox to be consistent with combobox
listBox.Font = comboBox1.Font;
// add listbox below combobox
listBox.Location = new Point(comboBox1.Location.X, comboBox1.Location.Y + comboBox1.Height);
// filter suggest items
listBox.Items.Clear();
foreach (string item in comboBox1.Items)
{
if (item.StartsWith(comboBox1.Text) && comboBox1.Text != string.Empty)
{
listBox.Items.Add(item);
}
}
listBox.Visible = listBox.Items.Count > 0;
this.Controls.Add(listBox);
}
Test result：
Those are actually two areas which you can configure independently. According to this MSDN article,
To change settings:
Go to Tools – Options – Environment - Fonts and Colors
Under Show settings for: select either Statement Completion or Editor Tooltips (for Parameter Info and Quick Tips)
Change either the font or font size
I have added a context menu strip 'View' on my listview with some menu items, like Large icons/ Small icons/ Tiles.
Now whenever I select any of the options the respective view changes, but the menu doesn't get any Mark/ indication like that happens in Windows file explorer, where it shows bullet/ dot against the selected menu item.
Can someone please show, how I can get the similar dot/ bullet for my context menu?
I have tried CheckOnClick property which gets me a tick mark, but is there any other way that I could get that dot there?
Thanks in advance!
I couldn't find a way to get bullets/ dots like Windows File Explored's View options, but I used below logic and used checked states to indicate the selections made.
private void toolStripViewOptions_Click(object sender, EventArgs e)
{
ToolStripMenuItem selectedOption = sender as ToolStripMenuItem;
SetIndicationForSelectedOption(selectedOption);
}
private void SetIndicationForSelectedOption(ToolStripMenuItem selectedMenuItem)
{
ToolStripItemCollection menuItems = (contextMenuStrip.Items[(Int32)toolStripView.Tag] as ToolStripMenuItem).DropDownItems;
// Set checked state for only the selected view option and disable same for others.
foreach (ToolStripMenuItem item in menuItems)
{
if (selectedMenuItem == item)
selectedMenuItem.Checked = true;
else
item.Checked = false;
}
}
This worked for my requirement.
I've got a form that contains a listview which pulls in ticket info from a database. The database objects are all abstracted into a class library. There is a tabpage below the listview which displays various details of the tickets.
My problem is that I've implemented a search at the top of this form which isn't updating that tabpage, only the listview gets updated. After typing in keywords the listview refreshes properly and any items that dont' contain the keywords are removed until the text from the search box is cleared. But I can't get the tabpage to exhibit the same behavior. The tabpage still always contains all tickets.
For example, if I were to search for something where only 1 ticket was returned in the listview and say that ticket was the 10th ticket on record; the tabpage would show me details for the very first ticket. How can I get the tabpage to exhibit the same behavior as my listview after a search is made?
The tabpage currently gets filled with this function:
private void FillTicket()
{
try
{
if (listView1.SelectedIndices.Count > 0)
{
CTicket thistkt = comp.Tickets[listView1.SelectedIndices[0]];
dedit1.DocumentHTML = thistkt.LineItems.GetCombinedProblem();
dedit2.DocumentHTML = thistkt.LineItems.GetCombinedResolution();
lvAssignmentHistory.Items.Clear();
foreach (CInc_AssignmentHistory a in thistkt.AssignmentHistory)
{
ListViewItem itm = new ListViewItem();
itm.Text = a.pAsgn_Datetime.ToString();
itm.SubItems.Add(a.pAsgn_Group_fr);
itm.SubItems.Add(a.pAsgn_from);
itm.SubItems.Add(a.pAsgn_Group_to);
itm.SubItems.Add(a.pAsgn_to);
itm.SubItems.Add(a.pChanged_By);
lvAssignmentHistory.Items.Add(itm);
}
when this is called:
private void listView1_SelectedIndexChanged(object sender, System.EventArgs e)
{
//FillTicket();
if (txtBox_TicketSearch.Text != "")
{
FillTicketNothing();
}
else
{
FillTicket();
}
It seems to me you only update the tab page if the user selects different items in your ListView.
If your listView1_SelectedIndexChanged method is only a handler for the ListView.SelectedIndexChanged event, it is only called when the selection in listView1 changes, not when it's content is changed (without changing selection).
So you should call FillTicket when you changed the content of listView1.Items after your search.
Also, your FillTicket method only updates the tabpage if there are selected items in your ListView:
if (listView1.SelectedIndices.Count > 0)
I don't know if there is an else-branch for that if. If not, there will nothing change on your tab page if no items were selected. You may want to use listView1.Items.Count.
I try to scroll to the last selected item in a WPF DataGrid on the Loaded event. The DataGrid sits in a Tab. Everything is working when I test it in a normal Windows environment. But as soon as I touch the TabPage on a tablet instead of clicking it, it doesn't scroll to my last selected item.
This is my code so far:
private void dataGrid_Loaded(object sender, RoutedEventArgs e)
{
var currentItem = dataGrid.SelectedItem;
dataGrid.ItemsSource = sh.GetDataTable(<SQL Select statement>).DefaultView;
if (!(currentItem == null))
{
dataGrid.ScrollIntoView(currentItem);
}
}
I've also tried the solution I found here but it didn't work.
Edit:
For testing purposes I completely removed the dataGrid_Loaded event. Now I'm only loading data into the DataGrid at the start of the program. Even now it keeps the scroll position when I switch between tabs with mouse clicks but not with touch! Is this a bug in the .NET Framework?
With the help of the MSDN Community I was able to solve the problem.
I had to scroll to the end of the DataGrid, do a UpdateLayout() and then scroll to the Item I want.
Additionally I can't just set the ItemsSource every time because then the Item I saved before is not a valid Item of the DataGrid anymore.
So finally my dataGrid_Loaded method looks like this:
private void dataGrid_Loaded(object sender, RoutedEventArgs e)
{
object currentPos = dataGrid.SelectedItem;
if (dataGrid.ItemsSource == null)
{
dataGrid.ItemsSource = sh.GetDataTable("<SQL query>").DefaultView;
}
else
{
dataGrid.Items.Refresh();
}
if (currentPos != null)
{
dataGrid.ScrollIntoView(dataGrid.Items[dataGrid.Items.Count - 1]);
dataGrid.UpdateLayout();
dataGrid.ScrollIntoView(currentPos);
}
}
I hope this will help someone else who has the same problem.
For reference here is my german MSDN thread in which my problem was solved.
I have a program which uses a barcode scanner as input device so that means I need to keep the focus on a text box.
The program has a listview control and I select one of the items programatically when a certain barcode is scanned. I set the background color of the row by:
listviewitem.BackColor = Color.LightSteelBlue;
Things I have tried:
listview.HideSelection set to false
call listview.Focus() after setting the color
listviewitem.Focused set to true
call listview.Invalidate
call listview.Update()
call listview.Refresh()
different combinations of the above
I've also did combinations above stuff in a timer so that they are called on a different thread but still no success.
Any ideas?
More info:
The key here is the control focus. The listview control does not have the focus when I select one of the items.
I select one item by doing:
listView1.Items[index].Selected = true;
the Focus is always in the textbox.
the computer does not have keyboard or mouse, only a barcode reader.
I have this code to keep the focus on the textbox:
private void txtBarcode_Leave(object sender, EventArgs e)
{
this.txtBarcode.Focus();
}
You need to have a textbox add that code to simulate my problem.
What you describe works exactly as expected, assuming that you've set the HideSelection property of the ListView control to False. Here's a screenshot for demonstration purposes. I created a blank project, added a ListView control and a TextBox control to a form, added some sample items to the ListView, set its view to "Details" (although this works in any view), and set HideSelection to false. I handled the TextBox.Leave event just as you showed in the question, and added some simple logic to select the corresponding ListViewItem whenever its name was entered into the TextBox. Notice that "Test Item Six" is selected in the ListView:
Now, as I suspected initially, you're going to mess things up if you go monkeying around with setting the BackColor property yourself. I'm not sure why you would ever want to do this, as the control already uses the default selection colors to indicate selected items by default. If you want to use different colors, you should change your Windows theme, rather than trying to write code to do it.
In fact, if I add the line item.BackColor = Color.LightSteelBlue in addition to my existing code to select the ListViewItem corresponding to the name typed into the TextBox, I get exactly the same thing as shown above. The background color of the item doesn't change until you set focus to the control. That's the expected behavior, as selected items look different when they have the focus than they do when their parent control is unfocused. Selected items on focused controls are painted with the system highlight color; selected items on unfocused controls are painted with the system 3D color. Otherwise, it would be impossible to tell whether or not the ListView control had the focus. Moreover, any custom BackColor property is completely ignored by the operating system when the ListView control has the focus. The background gets painted in the default system highlight color.
Explicitly setting the focus to the ListView control, of course, causes the custom background color to be applied to the ListViewItem, and things render with a color that very much contrasts with the color scheme that I've selected on my computer (remember, not everyone uses the defaults). The problem, though, becomes immediately obvious: you can't set the focus to the ListView control because of the code you've written in the TextBox.Leave event handler method!
I can tell you right now that setting the focus in a focus-changing event is the wrong thing to do. It's a hard rule in Windows you're not allowed to do things like that, and the documentation even warns you explicitly not to do it. Presumably, your answer will be something along the lines of "I have to", but that's no excuse. If everything were working as expected, you wouldn't be asking this question in the first place.
So, what now? Your application's design is broken. I suggest fixing it. Don't try and monkey with setting the BackColor property yourself to indicate that an item is selected. It conflicts with the default way that Windows highlights selected items. Also, don't try and set the focus in a focus-changing event. Windows explicitly forbids this, and the documentation is clear that you're not supposed to do this. If the target computer doesn't have a mouse or keyboard, it's unclear how the user is going to set focus to anything else in the first place, unless you write code to do it, which you shouldn't be doing.
But I have surprisingly little faith that you'll want to fix your application. People who ignore warnings in the documentation tend to be the same people who don't listen to well-meaning advice on Q&A sites. So I'll throw you a bone and tell you how to get the effect you desire anyway. The key lies in not setting the ListViewItem's Selected property, which avoids the conflict between your custom BackColor and the system default highlight color. It also frees you from having to explicitly set the focus to the ListView control and back again (which, as we established above, isn't actually happening, given your Leave event handler method). Doing that produces the following result:
And here's the code—it's not very pretty, but this is just a proof of concept, not a sample of best practice:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
listView1.View = View.Details;
listView1.HideSelection = false;
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
foreach (ListViewItem item in listView1.Items)
{
if (item.Text == textBox1.Text)
{
item.BackColor = Color.LightSteelBlue;
return;
}
}
}
private void textBox1_Leave(object sender, EventArgs e)
{
this.textBox1.Focus();
}
}
A standard ListView does not let you set the background color of a selected row. The background (and foreground) colors of a selected row are always controlled by the theme of the OS.
You have to owner draw your ListView to get around this OR you can use ObjectListView. ObjectListView is an open source wrapper around .NET WinForms ListView, which makes it much easier to use, as well as easily allowing things that are very difficult in a normal ListView -- like changed the colors of selected rows.
this.objectListView1.UseCustomSelectionColors = true;
this.objectListView1.HighlightBackgroundColor = Color.Lime;
this.objectListView1.UnfocusedHighlightBackgroundColor = Color.Lime;
This shows the ObjectListView when it does not have focus.
Here's a solution for a ListView that does not allow multiple selections and
does not have images (e.g. checkboxes).
Set event handlers for the ListView (in this example it's named listView1):
DrawItem
Leave (invoked when the ListView's focus is lost)
Declare a global int variable (i.e. a member of the Form that contains the ListView,
in this example it's named gListView1LostFocusItem) and assign it the value -1
int gListView1LostFocusItem = -1;
Implement the event handlers as follows:
private void listView1_Leave(object sender, EventArgs e)
{
// Set the global int variable (gListView1LostFocusItem) to
// the index of the selected item that just lost focus
gListView1LostFocusItem = listView1.FocusedItem.Index;
}
private void listView1_DrawItem(object sender, DrawListViewItemEventArgs e)
{
// If this item is the selected item
if (e.Item.Selected)
{
// If the selected item just lost the focus
if (gListView1LostFocusItem == e.Item.Index)
{
// Set the colors to whatever you want (I would suggest
// something less intense than the colors used for the
// selected item when it has focus)
e.Item.ForeColor = Color.Black;
e.Item.BackColor = Color.LightBlue;
// Indicate that this action does not need to be performed
// again (until the next time the selected item loses focus)
gListView1LostFocusItem = -1;
}
else if (listView1.Focused) // If the selected item has focus
{
// Set the colors to the normal colors for a selected item
e.Item.ForeColor = SystemColors.HighlightText;
e.Item.BackColor = SystemColors.Highlight;
}
}
else
{
// Set the normal colors for items that are not selected
e.Item.ForeColor = listView1.ForeColor;
e.Item.BackColor = listView1.BackColor;
}
e.DrawBackground();
e.DrawText();
}
Note: This solution will result in some flicker. A fix for this involves subclassing the ListView control so you
can change the protected property DoubleBuffered to true.
public class ListViewEx : ListView
{
public ListViewEx() : base()
{
this.DoubleBuffered = true;
}
}
On SelectedIndexChanged:
private void lBxDostepneOpcje_SelectedIndexChanged(object sender, EventArgs e)
{
ListViewItem item = lBxDostepneOpcje.FocusedItem as ListViewItem;
ListView.SelectedIndexCollection lista = lBxDostepneOpcje.SelectedIndices;
foreach (Int32 i in lista)
{
lBxDostepneOpcje.Items[i].BackColor = Color.White;
}
if (item != null)
{
item.Selected = false;
if (item.Index == 0)
{
}
else
{
lBxDostepneOpcje.Items[item.Index-1].BackColor = Color.White;
}
if (lBxDostepneOpcje.Items[item.Index].Focused == true)
{
lBxDostepneOpcje.Items[item.Index].BackColor = Color.LightGreen;
if (item.Index < lBxDostepneOpcje.Items.Count-1)
{
lBxDostepneOpcje.Items[item.Index + 1].BackColor = Color.White;
}
}
else if (lBxDostepneOpcje.Items[item.Index].Focused == false)
{
lBxDostepneOpcje.Items[item.Index].BackColor = Color.Blue;
}
}
}
You cant set focus on listview control in this situation. txtBarcode_Leave method will prevent this. But if you are desire to be able select listview items by clicking on them, just add code below to MouseClick event handler of listview:
private void listView1_MouseClick(object sender, MouseEventArgs e)
{
ListView list = sender as ListView;
for (int i = 0; i < list.Items.Count; i++)
{
if (list.Items[i].Bounds.Contains(e.Location) == true)
{
list.Items[i].BackColor = Color.Blue; // highlighted item
}
else
{
list.Items[i].BackColor = SystemColors.Window; // normal item
}
}
}
This change color of selected item. but only in state listview not have focus.
Make sure HideSelection is !TRUE! and simple use this code:
private void ListView_SelectedIndexChanged(object sender, EventArgs e){
foreach(ListViewItem it in ListView.Items)
{
if (it.Selected && it.BackColor != SystemColors.Highlight)
{
it.BackColor = SystemColors.Highlight;
it.ForeColor = SystemColors.HighlightText;
}
if (!it.Selected && it.BackColor != SystemColors.Window)
{
it.BackColor = SystemColors.Window;
it.ForeColor = SystemColors.WindowText;
}
}
}
Just do like this:
Set property UnfocusedHighlighForegroundColor = "Blue"
Set property UnfocusedHighlighBackgroundColor = "White"
Set property UserCustomSelectionColors = true
Good luck :)