Search the Community

Hello everyone here. I have a VCL program which I would now like to convert to UniGui. It's an easy part here, at least I thought so in the beginning. There is a TImage in which I want to draw a rectangle, which is transparent as a TShape. I do my program like this Shape is a TShape; OnMouseDown Shape.Left := X; Shape.Top := Y; Shape.Width := 0; Shape.Height := 0; OnMouseMove Shape.Width := X - Shape.Left; Shape.Height := Y - Shape.Top; OnMouseUP Shape.Width := X - Shape.Left; Shape.Height := Y - Shape.Top; repaint; At the end I would also like to have the coordinates of the shape. There is no onMouseMove in TUniImage, but that wouldn't be so bad because the rectangle is mainly drawn at the end. Can someone help me here? Is there an alternative to TShape for UniGui? Thanks in advance for your help. Tanja

my sample based on tip by Fernando Rizzato (MVP Embarcadero lead South America) unit uFormMain; interface uses System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants, System.Permissions, FMX.Types, FMX.Controls, FMX.Forms, FMX.Graphics, FMX.Dialogs, FMX.Layouts, FMX.Controls.Presentation, FMX.StdCtrls, FMX.ListBox, FMX.Objects, FMX.ScrollBox, FMX.Memo, FMX.Media; type TfrmFormMain = class(TForm) lytFormMain: TLayout; lytFormMainToolBar: TLayout; lytFormMainClientArea: TLayout; tbarFormMainMenu: TToolBar; sbtnCAMStartCamera: TSpeedButton; cmbboxCAMDevices: TComboBox; imgVideoCapture: TImage; mmMyLog: TMemo; sbtnCAMStopCamera: TSpeedButton; procedure FormCreate(Sender: TObject); procedure sbtnCAMStartCameraClick(Sender: TObject); procedure FormClose(Sender: TObject; var Action: TCloseAction); procedure imgVideoCaptureTap(Sender: TObject; const Point: TPointF); procedure sbtnCAMStopCameraClick(Sender: TObject); procedure cmbboxCAMDevicesChange(Sender: TObject); procedure FormResize(Sender: TObject); procedure FormActivate(Sender: TObject); private procedure prcMyLog(lText: string); // procedure prcCAMDevicesSetting; procedure prcCAMStartCapture; // {$IF DEFINED(ANDROID)} procedure prcPermissionsResulted(Sender: TObject; const APermissions: TArray<string>; const AGrantResults: TArray<TPermissionStatus>); procedure prcDisplayRationale(Sender: TObject; const APermissions: TArray<string>; const APostRationaleProc: TProc); {$ENDIF} // procedure prcCAMSampleBufferReady(Sender: TObject; const ATime: TMediaTime); procedure prcCAMSampleBufferSync; public end; var frmFormMain : TfrmFormMain; FFormTopPositionBeforeResize: integer = 0; implementation {$R *.fmx} { This sample, will use the "TVideoCaptureDevice" (class base to "TCameraComponent") directly!!! This class is defined in "FMX.Media.pas" // TDialogService.ShowMessage() used for dont block main-thread! } // uses FMX.DialogService {$IF DEFINED(ANDROID)} , FMX.Helpers.Android, Androidapi.JNI.JavaTypes, Androidapi.Helpers, Androidapi.JNI.OS {$ENDIF} ; // var lMyCAMDevice : TVideoCaptureDevice; lMyCAMPermission: string; function fncMyIIF(lBooleanExpr: boolean; lTextTrue, lTextFalse: string): string; begin result := lTextFalse; // if lBooleanExpr then result := lTextTrue; end; procedure TfrmFormMain.prcMyLog(lText: string); begin mmMyLog.Lines.Add(lText); end; procedure TfrmFormMain.cmbboxCAMDevicesChange(Sender: TObject); begin {$IF NOT DEFINED(ANDROID)} try lMyCAMDevice := nil; // lMyCAMDevice := TVideoCaptureDevice(TCaptureDeviceManager.Current.GetDevicesByName(cmbboxCAMDevices.Selected.Text)); // sbtnCAMStartCamera.Enabled := not(lMyCAMDevice = nil); // except on E: Exception do prcMyLog('Error Start CAM' + #13#10 + E.Message); end; {$ENDIF} end; procedure TfrmFormMain.FormActivate(Sender: TObject); begin {$IF NOT DEFINED(ANDROID)} FFormTopPositionBeforeResize := Self.Top; { when the user move the forms, needs change it too! } {$ENDIF} end; procedure TfrmFormMain.FormClose(Sender: TObject; var Action: TCloseAction); begin if not(lMyCAMDevice = nil) then begin {$IF DEFINED(ANDROID)} // if PermissionsService.IsEveryPermissionGranted([lMyCAMPermission]) then; if PermissionsService.IsPermissionGranted(lMyCAMPermission) then {$ENDIF} begin if (lMyCAMDevice.State = TCaptureDeviceState.Capturing) then lMyCAMDevice.StopCapture; end; // // lMyCAMDevice.Free; // if necessary!!! end; end; procedure TfrmFormMain.FormCreate(Sender: TObject); begin {$IF NOT DEFINED(ANDROID)} FFormTopPositionBeforeResize := Self.Top; {$ENDIF} // // // Form.OnCreate is not better place to "critial" procedure! // Here, only basic procedures! // Self.Position := TFormPosition.ScreenCenter; sbtnCAMStopCamera.Text := 'Stop Cam'; // prcCAMDevicesSetting; // if necessary, move it for another place! // if not(lMyCAMDevice = nil) then begin prcMyLog(lMyCAMDevice.ToString); // unfortunatelly, dont have Name or Description on Mobile Android // sbtnCAMStartCamera.Enabled := True; end else prcMyLog('MyCAMDevice = nil'); end; procedure TfrmFormMain.FormResize(Sender: TObject); begin {$IF NOT DEFINED(ANDROID)} if (Self.Height <= 480) then begin Self.Top := FFormTopPositionBeforeResize; Self.Height := 480; end; // if (Self.Width <= 640) then Self.Width := 640; // to avoid that ComboBox is gone...! {$ENDIF} end; procedure TfrmFormMain.imgVideoCaptureTap(Sender: TObject; const Point: TPointF); {$IF DEFINED(ANDROID)} var lObject: string; {$ENDIF} begin {$IF DEFINED(ANDROID)} // for "TAPing" tests! // lObject := ''; // if not(Sender = nil) then lObject := Sender.ClassName; // TDialogService.ShowMessage( { } Format('Object=%s, Point X=%f, Y=%f, V[0]=%f, V[1]=%f, IsZero=%s', [ { } lObject, Point.X, Point.Y, Point.V[0], Point.V[1], { } fncMyIIF(Point.IsZero, 'is zero', 'is not zero') { } ])); {$ENDIF} end; procedure TfrmFormMain.prcCAMDevicesSetting; {$IF NOT DEFINED(ANDROID)} var DeviceList: TCaptureDeviceList; i : integer; {$ENDIF} begin {$IF DEFINED(ANDROID)} cmbboxCAMDevices.Visible := False; try // Normally, there is only 1 cam in Mobile! // // NOTE: any try to read or change any property from CAM, NEEDS "permissions"!!! lMyCAMDevice := TCaptureDeviceManager.Current.DefaultVideoCaptureDevice; // lMyCAMDevice.OnSampleBufferReady := prcCAMSampleBufferReady; // showing our video on TImage // // DONT TRY READ or CHANGE any property from CAMDevice here!!! // Like: Start or Stop, Quality, IsDefault, etc... // Only later your "permissions" to be given by user!!! except on E: Exception do prcMyLog('Error CAM definition' + #13#10 + E.Message); end; {$ELSE} DeviceList := TCaptureDeviceManager.Current.GetDevicesByMediaType(TMediaType.Video); // for i := 0 to (DeviceList.Count - 1) do cmbboxCAMDevices.Items.Add(DeviceList[i].Name); {$ENDIF} end; {$IF DEFINED(ANDROID)} // DisplayRationale and PermissionsResulted is used only mobile! procedure TfrmFormMain.prcDisplayRationale(Sender: TObject; const APermissions: TArray<string>; const APostRationaleProc: TProc); var lRationaleMsg: string; i : integer; begin for i := 0 to high(APermissions) do begin if APermissions[i] = lMyCAMPermission then lRationaleMsg := lRationaleMsg + 'This app needs access your CAM to works' + SLineBreak + SLineBreak; end; // // Show an explanation to the user *asynchronously* - don't block this thread waiting for the user's response! // After the user sees the explanation, invoke the post-rationale routine to request the permissions // TDialogService.ShowMessage(lRationaleMsg, procedure(const AResult: TModalResult) begin // TProc is defined in System.SysUtils // APostRationaleProc; // used by System to go-back in before function... end) end; procedure TfrmFormMain.prcPermissionsResulted(Sender: TObject; const APermissions: TArray<string>; const AGrantResults: TArray<TPermissionStatus>); begin // verifying if the permissions was granted! - Here, testing only 1 permission = CAM if (Length(AGrantResults) = 1) and (AGrantResults[0] = TPermissionStatus.Granted) then prcCAMStartCapture { execute your procedure here if all it's ok } else TDialogService.ShowMessage('The permission <<CAMERA access>> not allowed by user'); end; {$ENDIF} procedure TfrmFormMain.prcCAMSampleBufferReady(Sender: TObject; const ATime: TMediaTime); begin // ****** // DONT USE "main thread" to process something "critial" like: process images by Cam // or anyother that can "crash" your UI (user interface) or app!!! // *************************************************************** // If exist images to process, then, put it on a "queue" to execute it! // Here, "prcSampleBufferSync" will be called always in a queue from main thread (your app) // to "dont paralize it" while the images it's processed!!! // // .............."main thread".........."method called" // TThread.Queue(TThread.CurrentThread, prcCAMSampleBufferSync); // end; procedure TfrmFormMain.prcCAMSampleBufferSync; begin // // use your imagination, to redirect this buffer !!! :) // // in the meantime ... let's write the pictures coming from the camera in the TImage lMyCAMDevice.SampleBufferToBitmap(imgVideoCapture.Bitmap, True); // end; procedure TfrmFormMain.prcCAMStartCapture; begin if not(lMyCAMDevice = nil) then begin // to Mobile (Android), change properties from CAMERA, needs permission! {$IF DEFINED(ANDROID)} if PermissionsService.IsPermissionGranted(lMyCAMPermission) then {$ENDIF} begin try lMyCAMDevice.StopCapture; // to avoid any error below // lMyCAMDevice.Quality := TVideoCaptureQuality.PhotoQuality; // lMyCAMDevice.StartCapture; // starting video capture! // prcMyLog('CAM device = Capture stated!'); prcMyLog('CAM ' + fncMyIIF(lMyCAMDevice.IsDefault, 'is', 'is not') + ' Default'); prcMyLog('CAM ' + fncMyIIF(lMyCAMDevice.HasFlash, 'has', 'has not') + ' Flash'); except on E: Exception do prcMyLog('Error Start CAM' + #13#10 + E.Message); end; end {$IF DEFINED(ANDROID)} else TDialogService.ShowMessage('Then CAM device needs your permission to access it!'); {$ENDIF} end else TDialogService.ShowMessage('None CAM device defined!'); end; procedure TfrmFormMain.sbtnCAMStopCameraClick(Sender: TObject); begin if not(lMyCAMDevice = nil) then begin // Needs "permissions" to read or change CAM properties! // {$IF DEFINED(ANDROID)} if PermissionsService.IsPermissionGranted(lMyCAMPermission) then {$ENDIF} begin if (lMyCAMDevice.State = TCaptureDeviceState.Capturing) then lMyCAMDevice.StopCapture else lMyCAMDevice.StartCapture; end {$IF DEFINED(ANDROID)} else TDialogService.ShowMessage('The <<CAMERA access>> permission is necessary'); {$ENDIF} end; end; procedure TfrmFormMain.sbtnCAMStartCameraClick(Sender: TObject); begin {$IF DEFINED(ANDROID)} PermissionsService.RequestPermissions( { } [lMyCAMPermission], { } prcPermissionsResulted, { } prcDisplayRationale { = nil, if you DONT WANT show any message! } ); {$ELSE} prcCAMStartCapture; // MSWindows or macOS {$ENDIF} end; initialization lMyCAMDevice := nil; {$IF DEFINED(ANDROID)} lMyCAMPermission := JStringToString(TJManifest_permission.JavaClass.CAMERA); {$ENDIF} finalization end. hug