Serge_G

Fool I am with this unnecessary interface ! In fact, it does exists yet.

So here is my steps with a TListView / DynamicAppearance without passing it in Edit mode

There for write  the OnItemClickEvent (here my DynamicAppearance contains an TlistItemImage named 'Image'

here is dfm part

    object YourListView: TListView
      ItemAppearanceClassName = 'TDynamicAppearance'
      ItemEditAppearanceClassName = 'TDynamicAppearance'
      HeaderAppearanceClassName = 'TListHeaderObjects'
      FooterAppearanceClassName = 'TListHeaderObjects'
      Position.X = 32.000000000000000000
      Position.Y = 360.000000000000000000
      Size.Width = 225.000000000000000000
      Size.Height = 265.000000000000000000
      Size.PlatformDefault = False
      TabOrder = 5
      ItemAppearanceObjects.ItemObjects.ObjectsCollection = <
        item
          AppearanceObjectName = 'Image'
          AppearanceClassName = 'TImageObjectAppearance'
          Appearance.ScalingMode = Stretch
        end
        item
          AppearanceObjectName = 'Text1'
          AppearanceClassName = 'TTextObjectAppearance'
        end>
      ItemAppearanceObjects.ItemEditObjects.ObjectsCollection = <
        item
          AppearanceObjectName = 'Text1'
          AppearanceClassName = 'TTextObjectAppearance'
        end>
      OnItemClick = YourListViewItemClick
    end

and code part

var AListItemBitmap : TListItemImage;
    AListItemText : TListItemText;
    AColor : TAlphaColor;
begin
YourListView.Items.SetChecked(AItem.Index,not Aitem.Checked);
AListItemBitmap:=AItem.Objects.FindObjectT<TListItemImage>('Image');
if Assigned(AListItemBitmap) then
 begin
     AListItemBitmap.OwnsBitmap:=True; 
     AListItemBitmap.Bitmap:=TBitmap.Create(40,40);
     if AItem.Checked then AColor:=TAlphaColorRec.AliceBlue
                      else AColor:=TAlphaColorRec.Null;
     AListItemBitmap.Bitmap.Clear(Acolor);
 end; 

but you can change text font (afraid AListItemText.TextColor don't work)

AListItemText:=AItem.Objects.FindObjectT<TListItemText>('Text1');
if Assigned(AListItemText) then
     if AItem.Checked then AListItemText.Font.Style:=[TFontStyle.fsBold]
                      else AListItemText.Font.Style:=[];

Quote

My problem is I want to skip the checkboxes.

Well you can skip or hide , putting the listview in edit mode and hiding the checkbox works "as expected". I put commas in reference to my previous post.

Using a Dynamic appearance this is the best way because checkbox doesn't react (point 2, bug ?)

Quote

2- I try to do the same thing but with appearance I prefer, the TDynamicAppearance one. In this case the checkbox don't react

But color change  the only thing is to find how the color is changing and set-it

Quote

My guess is I actually have to hook the click to the underlying database... Tag to set it on/off, but obviously it's not enough.

Well, if you have a Boolean field to bind, yes (I am writing another tutorial about Listview and ListImage but in review/correction till now).

I checked for event like "OnChecked"  or similar but for now I don't found one reachable, I searched in Interface IListViewCheckProvider and  IListViewPresentation but without good result.

I am looking for the checkbox drawing in the source but it's a little hard to track !

The more I check for selection the more I think there is a bug there but, "scalded cat fears cold water", I don't want to report to Bug Tracker (2 last one I report was said to be yet reported and one not reproducible)  without any proof/solution 
 

I also work on an interface

 IListViewSelectedItems = interface
   ['{3D8B9910-A017-4A10-8260-D44E9F7129B7}']
   procedure StartSelection;
   procedure SetSelected(Value : TList<Integer>);
   function  GetSelected :  TList<Integer>;
   property  Selected :  TList<Integer> read GetSelected write SetSelected;
 end;

   TListView = class(FMX.ListView.TListView,IListViewSelectedItems)
   private
     FSelected : TList<Integer>;
   public
     constructor Create(AOwner : TObject); // <<<<<<<<<<<<
     destructor Destroy; override;
     procedure StartSelection;
     procedure SetSelected(Value : TList<Integer>);
     function  GetSelected :  TList<Integer>;
     property  Selected :  TList<Integer> read GetSelected write SetSelected;
   end;

{ TListView override}        
procedure TListView.StartSelection;
begin
if not Assigned(FSelected) then FSelected:=TList<Integer>.Create;        
end;

function TListView.GetSelected : TList<Integer>;
begin
result := FSelected;       
end;       

procedure TlistView.SetSelected(value : TList<Integer>);
begin
FSelected:=Value;       
end;       

Here I can surely add an OnSelect event,(optionally a ClearSelection, SelectAll procedure).

But I am still blocked

   1 - a way to initialize FSelected at creation time (without using StartSelection)

   2 -on painting selection (overriding  or duplicating IListViewCheckProvider ?)    

Hi, sorry for delay but if it is still in actuality  here is how i make this

with  TBindGridLink.Create(Self) do
  begin
      ControlComponent := Grid1;
      SourceComponent := AdapterBindSource1;
      // Filling Grid
      ColumnExpressions.AddExpression; // adding a right filler
      with ColumnExpressions.AddExpression do // ColumnName = 'Code', ColumnIndex = 1
        begin
          SourceMemberName := 'Code';
          with FormatCellExpressions.AddExpression do
            begin
              ControlExpression := 'Data';
              SourceExpression := 'Value';
            end;
        end;
	  // an so on for columns 
	  
	  // MANDATORY TO NAVIGATE 
      // Position (synchronisation entre la liste et la grille)
      with PosControlExpressions.AddExpression do
        begin
          ControlExpression := 'Selected';
          SourceExpression := 'Math_Max(0,ItemIndex)';
        end;
      with PosSourceExpressions.AddExpression do
        begin
          ControlExpression := 'Math_Max(0,Selected)';
          SourceExpression := 'ItemIndex';
        end;
		
      // Working on columns size
      with FormatControlExpressions.AddExpression do
        begin
          ControlExpression := 'Columns[0].width';
          SourceExpression := '20';
        end;
      with FormatControlExpressions.AddExpression do
        begin
          ControlExpression := 'Columns[1].width';
          SourceExpression := '140';
        end;
      // and so on ...
  end;

Hi,

Try TMS Cryptography pack

Even if tagged as VCL it works for me in FMX environment. Well I don't use Xades but Pades so I should be pleased to know if it works also for Xades

TMS offer also 2 free tools a certificate generator and a Ades document signature program done with the cryptography pack.

Note, the team who wrote the component (Bernard Roussely and Marion Candau) is very reactive

Quote

You will be in my thanks in the about box of the app

😤

Well, I follow the track with those selections in edit mode, and I am disappointed  !

2 black points with the checkbox

1- with the common appearance (ListItemChecked, and all same type appearance). It works but if you don't want the checkbox checked when the item is clicked  in theory  you have to use option ClickOnSelect of TGlyphObjectButtonObject but this option as no effect (note was working with XE4)

2- I try to do the same thing but with appearance I prefer, the TDynamicAppearance one. In this case the checkbox don't react

One question to @sjordi  which event did you use for your selection,  OnItemClick or OnItemClickEx ?      

I knew I can find a better solution not involving bitmaps in the datasource .

Here is the new code

procedure TForm1.ListView1UpdatingObjects(const Sender: TObject;
  const AItem: TListViewItem; var AHandled: Boolean);
var AListItemBitmap : TListItemImage;
    AListItemText : TListItemText;
    AColor : TAlphaColor;
    i : Word;
begin
AListItemBitmap:=AItem.Objects.FindObjectT<TListItemImage>('Image2');
AListItemText:=AItem.Objects.FindObjectT<TListItemText>('Text1');
if Assigned(AListItemBitmap) then
 begin
     AListItemBitmap.OwnsBitmap:=True; // this is the trick
     AListItemBitmap.Bitmap:=TBitmap.Create(40,40);
     try
       AColor:=StringToAlphaColor(AListItemText.Text)
     except // certaines couleurs sont inconnues! i.e. monneygreen, ltgrey
      AColor:=TAlphaColorRec.Null;
     end;
     AListItemBitmap.Bitmap.Clear(Acolor); //:=ABitmap;
 end;
{$ENDIF}
end;

See line 12.

Icing on the cake freeing bitmaps created is not needed anymore !

Tested on Windows10 and Android, hope it works on OSX and iOS 

Even if this workaround works 👍, for me it's not satisfactory. I don't understand why this bitmap creation does not work on mobile devices !  

Damned ! As far as I remember I test these codes with Berlin version but not for mobile devices.

I investigate, (check my old hard disk to remember my various tests) and found the problem but no solution yet.

I was right it as to do with bitmap !

But I cheat a little . I don't know which source you use, hope it's the color demo one. 

Cheating :

I add a bitmap to my Tprotypebindsource .

I link this one to the image object of the list, doing that we don't need to create (and destroy) bitmaps.

Finally I change my code

procedure TForm1.ListView1UpdatingObjects(const Sender: TObject;
  const AItem: TListViewItem; var AHandled: Boolean);
var AListItemBitmap : TListItemImage;
    AListItemText : TListItemText;
    AColor : TAlphaColor;
begin
AListItemBitmap:=AItem.Objects.FindObjectT<TListItemImage>('Image2');
AListItemText:=AItem.Objects.FindObjectT<TListItemText>('Text1');
if Assigned(AListItemBitmap) then
 begin
 //    AListItemBitmap.Bitmap:=TBitmap.Create(40,40);
     try
       AColor:=StringToAlphaColor(AListItemText.Text)
     except // certaines couleurs sont inconnues! i.e. monneygreen, ltgrey
      AColor:=TAlphaColorRec.Null;
     end;
     AListItemBitmap.Bitmap.Clear(AColor);
 end;
end;

Don't forget to remove the onCloseQuery event 

And, as you can see, image attached, it works !

After this "ascertainment", I dug in the developpez.net forum and found this post i wrote. The goal is now to mix the two but how ? 

Hum,  here you touch a point "I am not a pear 😣" = "I don't have any Apple device (jealous)"  so I could not check my code  on these systems, I had to trust developpez.net technical correctors and some beta testers.

None of them rise this behavior though !

Now, as far as I guess could be a problem with style, I ran in this problem when stylecollection have various entries.

On another hand, I use a Bitmap (and I read somewhere Apple is not really fan of windows things) it's perhaps there a response   

Using a list object (even an invisible one) is the easiest way but if you want to have a quick "SelectedItems.count" that's not the fastest way.

Sleeping on my second option, using interface, I think it's the best one. Reviewing one Marco Cantu's lesson "Advanced Interface : Using Interfaces to Implement an Adapter Pattern" on Embarcadero Academy my opinion seems to be confirmed. 

// scheme interface
ISelectedLstViewItems = Interface

['{A3A6DE5C-496B-4766-89FF-23F08EA5B329}']

function GetSelectedItems : TList<Integer>;

procedure SetSelectedItem(Value : TList<Integer>);

property SelectedItems : TList<Integer> read GetSelectedItems write SetSelectedItems;

end;

In my mind building an interface containing a SelectedItems as a TList<integer> and then overriding TListView as 

TListView = class(FMX.ListView.TListview, ISelectedLstViewItems)

in another unit should do the trick. 

The only thing I don't know is "is it possible to use TagObject for the "link" ?" (even if it is a contraint) . Think I will test this with my SearchListViewInterface (for info you can follow my steps here)

to sjordi "A quoi cela sert que Ducros il se décarcasse !"

I wrote various tutorials (and preparing some others) and blog post about TListView but in french you can read here https://serge-girard.developpez.com/

There are more than one solution to your goal

1- using a list object (i.e the color), yes it's one  

2- using an interface to keep all items selected is another one you can use.

I don't work on this part, currently working on customizing searching in TListView,  but in my mind an interface should do the trick easily. Hum, seem a good subject if y have some times