I am working on xamarin.forms application and I have question that I could not solve.
1) I have multiple Grids one after another that contain button, label and image. Now, on button click I want to change image or rotate it to down. But somehow, I am not able to do it.
My first try was to get parent of button and find image using FindByName method. But FindByName returns null, but I can see grid in parent while debugging.
My second try was to get row of button and find all the controls that are in that row. Because my image is in the same row as button.
My structure is something like this
My grid works fine but only rotation issue is there.
pubic void OnButtonClicked(object sender, EventArgs e)
{
var SenderButton = (Button)sender;
var row = Grid.GetRow(SenderButton); // Here i get row = 0 but dont know how to find other controls on same row.
Image upimage = SenderButton.Parent.FindByName<Image>("imageExpand"); // imageExpand is my image name in grid.
upimage.Source = "upimage.png";
}
Here upimage is null.
Thank you very much.
I'm only replying to your first question
you got it right, you can get the value of the attached bindable property Grid.Row using public static int GetRow(BindableObject bindable). Now it's quite easy to filter the grid's Children.
var button = (Button)sender;
var row = Grid.GetRow(button);
var grid = button.Parent as Grid;
//assuming the image is in column 1
var image = grid.Children.Where(c => Grid.GetRow(c) == row && Grid.GetColumn(c)==1);
Related
I have a generic Grid List Control. Which let me Bind the Item Source and ItemTemplate and it will generates the Column and Rows based on Number of Items or Based on how Users set the Rows and Columns. Its perfect until here. It supports all the generics I needed.
Now the Problem part:
I have a ContentView which will be used as Item Template for the Grid. This Template will be used for Multiple Data Types. I'm able to do it properly. Now I have one Data Type Where the First Cell should have RowSpan if it meets certain condition: The code below works perfect. It creates the RowSpan perfectly.
bool isYearBuilt = false;
bool isAny = false;
public FilterItemView()
{
InitializeComponent();
}
protected override void OnBindingContextChanged()
{
base.OnBindingContextChanged();
var context = BindingContext as PropertyFilterItem;
if (context == null)
return;
if(context.FilterType==PropertyFilterTypes.YearBuilt)
{
if(context.IsAny)
{
isYearBuilt = true; isAny = true;
}
}
}
protected override void OnParentSet()
{
base.OnParentSet();
GridList grid = this.Parent as GridList;
if (grid == null)
return;
if(isYearBuilt && isAny)
{
Grid.SetRowSpan(this, 2);
}
}
These are the Images; which will describe it more perfectly:
This is how it looks based on above code. We can see that it is creating RowSpan.
This is what I'm expecting to do.
The only problem is - While Setting RowSpan it is not refreshing the subsequent cells. Because, I'm applying the RowSpan in Runtime after the Grid and all the Cells are created. How can I refresh the Grid and other remaining cells to moved to their own cells?
Thank you for helping me.
Set the grid list's ItemsSource = null and set it back again to the item source you want.
Cause of the problem:
As you have said, While Setting RowSpan it is not refreshing the subsequent cells.
Solution:
After you have set rowspan using Grid.SetRowSpan(this, 2); you have to bind the datasource again.
Since I had my own Custom Grid List control. I implemented more Properties which let me know When I have to RowSpan for Child View in Grid and Adjust subsequent Child items. That was the only best way to deal with this problem rather than re-assigning the ItemSource property. Because, If we assign item source it will redraw all the items (including the rows and columns - not row/colspans). So we would still end up with same issue.
Solution: Added RowSpan logic in my Grid Control.
I have a RadGrid that has a WebUserControl for each row of the grid to allow the user to edit that row. When I click the edit button to expand the row (this opens up a .ascx control within the grid for that row), it always scrolls to the top of the page. The user then has to scroll down to find the row they selected with the row expanded to begin editing that row.
I found in another post that adding RadGrid1.ClientSettings.AllowKeyboardNavigation = true; prior to data binding the grid helps to maintain scroll position. This kind of works and you only have to scroll down one click of the mouse wheel to find the row to edit; not good enough.
I also have set MaintainScrollPositionOnPostback=“true" on the aspx page.
I also have set on the RadGrid itself under client settings SaveScrollPosition=“true".
What I'd like to see is the page not move at all when the user clicks on edit for the given row. I would like to maintain the scroll position on the page.
Can this be accomplished? If so, how?
I finally figured out why my grid always scrolled to the top. It was my fault. I wanted the user to see any message from the WebUserControl when control pass back to the parent page. The RadGrid1.ClientSettings.Scrolling.ScrollTop = 0; was the issue.
I had the following code listed:
private void DisplayMessage()
{
// Display any messages from RadGrid2 that occurred in WebUserControl
if (!string.IsNullOrEmpty(Convert.ToString(Session["LabelUpdated"])))
{
lblUpdated.Text = Convert.ToString(Session["LabelUpdated"]);
Session["LabelUpdated"] = null;
}
RadGrid1.ClientSettings.Scrolling.ScrollTop = "0";
lblUpdated.Focus();
}
I've since changed it to what is below:
private void DisplayMessage()
{
// Display any messages from RadGrid2 that occurren in WebUserControl
if (!string.IsNullOrEmpty(Convert.ToString(Session["LabelUpdated"])))
{
lblUpdated.Text = Convert.ToString(Session["LabelUpdated"]);
Session["LabelUpdated"] = null;
RadGrid1.ClientSettings.Scrolling.ScrollTop = "0";
lblUpdated.Focus();
}
}
After the change the grid will only scroll to the top when a message is present from the WebUserControl.
Here is what a portion of my screen looks like:
The user can pick a choice from the drop-down list and click the add button. Here is the code for the add button:
protected void btnModuleAdd_Click(object sender, EventArgs e)
{
var selectedModule = ddlModsList.SelectedItem.ToString();
var graphicName = this.GraphicName;
var xr = new GraphicModuleXRef();
xr.GraphicName = graphicName;
xr.Module = selectedModule;
// Take drop down list selection and add it to GraphicModuleXRef table.
var context = new XRefDataContext();
context.GraphicModuleXRefs.InsertOnSubmit(xr);
context.SubmitChanges();
}
Basically, it's taking the user's choice and writing it out to a table. This part works fine.
In my Page_Load, I check whether IsPostback and, if it is, I run the code below:
private void LoadOtherModulesUsed()
{
if (this.GraphicName != null)
{
lbModules.Items.Clear();
var context = new XRefDataContext();
var q = context.GraphicModuleXRefs
.Where(a => a.GraphicName.Contains(this.GraphicName));
foreach (GraphicModuleXRef gr in q)
{
lbModules.Items.Add(new ListItem(gr.Module.ToString()));
}
}
}
This code reads from a table, finds all records that match the criteria, and adds them to the listbox.
So, what I'm expecting to happen is for the page to reload and the listbox to be repopulated, including the new entry just added to the table. But, that isn't happening. The screen refreshes like it has reloaded, but the entry doesn't appear in the listbox. However, it IS there, it just can't be seen. If the user adds another entry, by clicking the Add button, the list 'rolls up' one row and the previous entry can be seen. But, not the new one. If the user exits from the screen and re-enters, all the entries in the listbox can be seen. It's almost like the listbox is too short to display all records, but I've tried different heights, with no difference.
I'm wondering if anyone can point me in the right direction?
Put simply, when adding a new item to the listbox, it isn't immediately visible unless another item is added, thereby 'rolling' the list up. Even scrolling the list with the scrollbar doesn't show the new entry until another entry is added. And, if you scroll the list up, you can see the prior entry. So strange!
EDIT: Trying to describe this more simply:
User adds item to listbox by pressing Add button.
New item does not appear in listbox.
User adds another item to listbox by press Add button.
Prior item now shows in listbox if user scrolls listbox up.
The newest item just added, however, does not appear unless step 3 is repeated.
Also, exiting the page and then coming back in loads every item in the list and all is visible.
This is a timing issue. Whats happening is Page_Load runs first in this case and THEN the Click event handler so effectively the control has been bound before the new entry is added. Thats why you're always one refresh behind. Id refactor your code like this so everything runs in the correct order! To understand the timing of event execution I strongly recommend reading this article on MSDN its AWESOME and will really help you get the best from ASP.NET.
Additionally reading this article on MSDN (Also awesome) especially the section on ViewState will explain how the DropDown retains its details even when, in the modified code, you're onlly filling it when the page is NOT a postback and when the click event is fired.
Hope this helps!
public void Page_Load(object sender, EventArgs e)
{
if (IsPostBack) return;
LoadOtherModulesUsed();
}
private void LoadOtherModulesUsed()
{
if (this.GraphicName != null)
{
lbModules.Items.Clear();
var context = new XRefDataContext();
var q = context.GraphicModuleXRefs
.Where(a => a.GraphicName.Contains(this.GraphicName));
foreach (GraphicModuleXRef gr in q)
{
lbModules.Items.Add(new ListItem(gr.Module.ToString()));
}
}
}
protected void btnModuleAdd_Click(object sender, EventArgs e)
{
var selectedModule = ddlModsList.SelectedItem.ToString();
var graphicName = this.GraphicName;
var xr = new GraphicModuleXRef();
xr.GraphicName = graphicName;
xr.Module = selectedModule;
// Take drop down list selection and add it to GraphicModuleXRef table.
var context = new XRefDataContext();
context.GraphicModuleXRefs.InsertOnSubmit(xr);
context.SubmitChanges();
LoadOtherModulesUsed();
}
I am working in DevExpress Gridview Concepts. I require one User Image in my grid field. i m working in winforms platforms.
My Datatable has only path of image. I dont know how to bind an image to repositoryPictureEdit Control
Kindly provide any solution.
You could using a ImageEdit. This is a dropdown of Images. So you generate Images first via:
Image.FromFile(Path);
Add them to a List or ImageList and fill the dropdown with it. Then you just bind the index of the picture to your column.
I hope this is able to work in your case.
edit: OR
At first you have to create a UnboundColumn in your Grid. Just create a column and set the Property 'UnboundType' to object. Then set a RepositoryPictureEdit as ColumnEdit. Now you have a Column which got a pictureedit in each row. To populate the Images you can handle the CustomUnboundColumnData event. This event you can find on the GridView.
To accomplish this task do following:
Run GridView Designer -> Change to columns at the left side
Add Column
In the Propertywindow ->
set the Columnedit to repositorypictureedit
set the UnboundType to object
Activate the CustomUnboundColumnData event (you can find in the
GridView) -> this event fires on loading Grid for every cell.
With e.ListSourceRowIndex you can get the row of your datasource appending to the unboundcolumn. So you could do following:
private void gridView1_CustomUnboundColumnData(object sender, DevExpress.XtraGrid.Views.Base.CustomColumnDataEventArgs e)
{
if (e.Column.Name == "MyColumn")
{
clsTest test = myListAsDataSource[e.ListSourceRowIndex];
e.Value = test.Bild;
}
}
I hope this can help you.
I have a Datagrid filled with a table. Now the vertical scrollbar shows up because the table doesn't fit. That's fine so far. Now in the last column I have defined a Button in the xaml file. All these buttons have the same callback, but I can distinguish from the selectedIndex of the table what this callback should do. Because clicking the button automatically also selects the line in the DataGrid where this button lives. That's fine so far. Now in my app, for some rows I want to disable the Button, because it has no meaning for that specific row. So what I did is take a subscription on event Load of each Button and let the callback set the MaxWidth = 0, if the button has no meaning. This works fine too, but only initially. As soon as I start dragging the scrollbar, at random places in the Button column buttons show up, or wrong buttons get MaxWidth = 0. I have the strong feeling that cells that scrolled out at the top are being reused at the bottom, but I don't get an event, or at least I don't know which event I should subscribe on. I don't know how to identify the scrollbar. Has anyone a suggestion to tackle this problem?
I finally found a solution to this problem myself, and I will post it for the record.
The event you should subscribe on is LoadingRow (generated by the DataGrid).
In the callback
void TableLoadingRow(object sender, DataGridRowEventArgs e)
you can identify an element in a cell by using VisualTreeHelper for instance as follows:
private void ButtonSetMaxWidth(DependencyObject reference, int maxWidth)
{
if (reference != null)
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(reference); i++)
{
var child = VisualTreeHelper.GetChild(reference, i);
if (child.GetType() == typeof(Button))
{
Button b = (Button)child;
if (b.Name == "TheNameOfTheButtonInTheXAML")
{
b.MaxWidth = maxWidth;
return;
}
}
ButtonSetMaxWidth(child, maxWidth);
}
}
return;
}