LazMapViewer: Fixed (2) Flickering of component on map, (4) Mark of track points, (5) Selection identification, (6) Red border; from issue #39088.

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@9552 8e941d3f-bd1b-0410-a28a-d453659cc2b4

components/lazmapviewer/source/mvmapviewer.pas

@@ -902,6 +902,7 @@ type
     function GetTracksOnly: TMapEditorTracksFilterEnumerator;
   public
     function IndexOfObj(const Item: TObject; out Index: Integer): Boolean;
+    function IsPresent(const Item: TObject): Boolean;
     function DelIfPresent(const Item: TObject): Boolean;
     function AddIfNotPresent(const Item: TObject): Boolean; inline;
 
@@ -4155,7 +4156,10 @@ begin
   // Item has been deleted from its parent collection,
   // delete it from the current selection if present.
   Item := TMapItem(Data);
-  FSelection.DelIfPresent(Item);
+  if FSelection.DelIfPresent(Item) and
+    (FSelection.Count > 0) and not (FSelection[0] is TMapPoint) // No points left?
+  then
+    FSelection.Clear;
 end;
 
 procedure TMapEditMark.ObserveItemColl(AItem: TObject);
@@ -4270,10 +4274,13 @@ begin
     Lon := TMapPoint(AObjs[0]).Longitude;
     FLit.Free;
     FLit := TMapObjectList.Create(AObjs);
+    FMapView.Invalidate;
   end
-  else
+  else if Assigned(FLit) then
+  begin
     FreeAndNil(FLit);
-  FMapView.Invalidate;
+    FMapView.Invalidate;
+  end;
 end;
 
 function TMapEditMark.ClickableAt(X, Y: Integer): Boolean;
@@ -4283,13 +4290,50 @@ end;
 
 function TMapEditMark.ClickAt(X, Y: Integer): Boolean;
 var
-  O: TObject;
-  H: Boolean;
+  O, O1: TObject;
+  H, Alt: Boolean;
+  I: Integer;
+
+  function GetAlt(P0: TObject): TObject;
+  var
+    P: TObject;
+    LeftOf: Boolean = False;
+  begin
+    Result := Nil;
+    for P in FLit.Points do
+      if not LeftOf and not FSelection.IsPresent(P) and (Result = Nil) then
+        Result := P
+      else if (P = P0) then
+        LeftOf := True
+      else if LeftOf and not FSelection.IsPresent(P) then
+        Exit(P);
+  end;
+
 begin
   Result := True;
   if Assigned(FLit) and AroundPt(X, Y, FPt) then
   begin
+    // Ctrl+click adds to selection
     FTruncSelection := not (ssCtrl in GetKeyShiftState);
+    for O in FLit.Points do
+      if FSelection.IndexOfObj(O, I) then
+      begin
+        // Alt+click selects the point below
+        Alt := ssAlt in GetKeyShiftState;
+        if Alt then
+        begin
+          O1 := GetAlt(O);
+          if Assigned(O1) then
+          begin
+            FSelection[I] := O1;
+            ObserveItemColl(O1);
+          end;
+        end;
+        if I > 0 then
+          FSelection.Exchange(I, 0);
+        Exit;
+      end;
+
     H := FSelection.DelIfPresent(FLit[0]);
     FTruncSelection := not H and FTruncSelection;
     FSelection.Insert(0, FLit[0]);
@@ -4402,6 +4446,11 @@ begin
   Result := Index >= 0;
 end;
 
+function TMapEditorList.IsPresent(const Item: TObject): Boolean;
+begin
+  Result := IndexOf(Item) >= 0;
+end;
+
 function TMapEditorList.DelIfPresent(const Item: TObject): Boolean;
 var
   I: Integer;

components/lazmapviewer/source/mvmapviewerpatheditform.lfm

@@ -2,30 +2,28 @@ object MapViewerPathEditForm: TMapViewerPathEditForm
   Left = 370
   Height = 90
   Top = 31
-  Width = 292
+  Width = 293
   BorderStyle = bsToolWindow
   Caption = 'MapViewer Path Editor'
   ClientHeight = 90
-  ClientWidth = 292
-  LCLVersion = '2.2.4.0'
+  ClientWidth = 293
   object pnlFrame: TPanel
     Left = 0
     Height = 90
     Top = 0
-    Width = 292
+    Width = 293
     Align = alClient
-    BevelColor = clRed
     ClientHeight = 90
-    ClientWidth = 292
+    ClientWidth = 293
     TabOrder = 0
     object pnlTools: TPanel
       Left = 1
       Height = 33
       Top = 1
-      Width = 290
+      Width = 291
       Align = alTop
       ClientHeight = 33
-      ClientWidth = 290
+      ClientWidth = 291
       ParentShowHint = False
       ShowHint = True
       TabOrder = 0
@@ -181,30 +179,30 @@ object MapViewerPathEditForm: TMapViewerPathEditForm
     end
     object lblSelectedPt: TLabel
       AnchorSideLeft.Control = pnlFrame
-      AnchorSideTop.Side = asrCenter
+      AnchorSideTop.Control = cbSelectedPt
       Left = 1
       Height = 16
-      Top = 39
-      Width = 82
+      Top = 37
+      Width = 83
       Alignment = taRightJustify
       Anchors = [akTop, akLeft, akRight]
       AutoSize = False
       BorderSpacing.Right = 5
-      Caption = 'Selection'
+      Caption = 'Selection:'
       ParentColor = False
     end
     object lblSelectedLayer: TLabel
       AnchorSideLeft.Control = pnlFrame
-      AnchorSideTop.Side = asrCenter
+      AnchorSideTop.Control = cbSelectedLayer
       Left = 1
       Height = 16
-      Top = 63
-      Width = 82
+      Top = 62
+      Width = 83
       Alignment = taRightJustify
       Anchors = [akTop, akLeft, akRight]
       AutoSize = False
       BorderSpacing.Right = 5
-      Caption = 'On Layer'
+      Caption = 'On Layer:'
       ParentColor = False
     end
     object cbSelectedPt: TEdit
@@ -212,7 +210,7 @@ object MapViewerPathEditForm: TMapViewerPathEditForm
       AnchorSideTop.Side = asrBottom
       AnchorSideRight.Control = pnlFrame
       AnchorSideRight.Side = asrBottom
-      Left = 87
+      Left = 88
       Height = 22
       Top = 37
       Width = 201
@@ -231,7 +229,7 @@ object MapViewerPathEditForm: TMapViewerPathEditForm
       AnchorSideTop.Side = asrBottom
       AnchorSideRight.Control = pnlFrame
       AnchorSideRight.Side = asrBottom
-      Left = 87
+      Left = 88
       Height = 22
       Top = 62
       Width = 201

components/lazmapviewer/source/mvmapviewerpatheditform.pas

@@ -406,6 +406,16 @@ var
   PtTxt: String;
   PtCnt: Integer = 0;
   HaveView, HaveLayer, HaveSel, HavePt: Boolean;
+
+  function ItemCap(AItem: TMapItem): String;
+  begin
+    Result := AItem.DisplayName;
+    if Result <> AItem.ClassName then
+      Result := Result + ': ' + AItem.ClassName;
+    if Assigned(AItem.Collection) then
+      Result := Format('%d - ', [AItem.Index]) + Result;
+  end;
+
 begin
   HaveView := Assigned(MapView);
   HaveSel := HaveView and MapView.EditMark.HasSelection;
@@ -424,7 +434,7 @@ begin
 
   // Update layer name
   if HaveLayer
-    then cbSelectedLayer.Text := MapLayer.DisplayName
+    then cbSelectedLayer.Text := ItemCap(MapLayer)
     else cbSelectedLayer.Text := '(none)';
   cbSelectedLayer.Hint := cbSelectedLayer.Text;
 
@@ -437,9 +447,7 @@ begin
     P := TMapPoint(MapView.EditMark.Selection[0]);
     if PtCnt > 0 then
     begin
-      PtTxt := P.DisplayName;
-      if PtTxt <> P.ClassName then
-        PtTxt := PtTxt + ': ' + P.ClassName;
+      PtTxt := ItemCap(P);
       if PtCnt > 1 then
         PtTxt := PtTxt + Format(' +%d more', [PtCnt - 1]);
     end;