By the way, the proper test is *if* ssMiddle *in* Shift *then* . . . since Shift is a set of values, not an enumerated value, meaning it can contain more than one value. Press a mouse key and <shift> or <alt> to see what I mean. What is your view? Is this a bug that ought to be fixed, or is it not? My vote is: "If Shift in OnMouseWheelxxx events is supposed to return an empty set, remove the parameter from the handling procedures. If you say "keep it" then ensure the parameter does carry a value.
Wolf
On 28/07/16 00:56, Ondrej Pokorny wrote:
On 27.07.2016 14:36, Vojtěch Čihák wrote:Hi,IMO it is correct. OnMouseWheelxxx are events for rolling the mouse wheel, therefore the ssMiddle cannot be in Shift.If you need to detect if Middle button is pressed, use OnMouseDown/OnMouseUp and test "if Mouse=mbMiddle then ..."Also, ssMiddle appears in Shift in OnMouseDown/OnMouseUp.You are not correct. You can scroll the mouse wheel if it is released or pressed. So for me a valid feature request for the distinction. The OnMouseMove event gets valid Shift states as well.Btw. please use a mail client that supports "In-Reply-To" and "References" headers. Your answers are registered always as a new thread. See the recent discussion with Denis Kozlov on fpc-devel list, thread(s) "NowUTC in FPC".Ondrej
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}
OnMouseDown = FormMouseDown
OnMouseUp = FormMouseUp
OnMouseWheel = FormMouseWheel
OnMouseWheelDown = FormMouseWheelDown
OnMouseWheelUp = FormMouseWheelUp
LCLVersion = '1.6.0.4'
object Label1: TLabel
Left = 16
Height = 18
Top = 16
Width = 277
Caption = 'Scroll your mouse wheel to change the value.'
ParentColor = False
end
object lblDirection: TLabel
Left = 16
Height = 23
Top = 48
Width = 73
Caption = 'Direction'
Font.Height = -17
ParentColor = False
ParentFont = False
end
object lblAmount: TLabel
Left = 168
Height = 28
Top = 72
Width = 12
Caption = '0'
Font.Height = -21
ParentColor = False
ParentFont = False
end
object Label2: TLabel
Left = 16
Height = 28
Top = 72
Width = 145
Caption = 'Scroll Amount:'
Font.Height = -21
ParentColor = False
ParentFont = False
end
object Label3: TLabel
Left = 32
Height = 18
Top = 112
Width = 102
Caption = 'Contents of Shift'
ParentColor = False
end
object Label4: TLabel
Left = 232
Height = 18
Top = 136
Width = 42
Caption = 'Label4'
ParentColor = False
end
object Memo1: TMemo
Left = 24
Height = 96
Top = 136
Width = 156
Lines.Strings = (
'Memo1'
)
TabOrder = 0
end
object Label5: TLabel
Left = 233
Height = 18
Top = 112
Width = 105
Caption = 'MouseUp/Down?'
ParentColor = False
end
end
unit frm1; // source: http://lazplanet.blogspot.co.nz/2013/06/how-to-capture-mouse-wheel-scroll.html {$mode objfpc}{$H+} interface uses Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs, StdCtrls, ExtCtrls, types, typinfo; type { TForm1 } TForm1 = class(TForm) Label1: TLabel; Label2: TLabel; Label3: TLabel; Label4: TLabel; Label5: TLabel; lblAmount: TLabel; lblDirection: TLabel; Memo1: TMemo; procedure FormMouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer); procedure FormMouseUp(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer); procedure FormMouseWheel(Sender: TObject; Shift: TShiftState; WheelDelta: Integer; MousePos: TPoint; var Handled: Boolean); procedure FormMouseWheelDown(Sender: TObject; Shift: TShiftState; MousePos: TPoint; var Handled: Boolean); procedure FormMouseWheelUp(Sender: TObject; Shift: TShiftState; MousePos: TPoint; var Handled: Boolean); private { private declarations } public { public declarations } end; var Form1: TForm1; MouseWheelPressed: boolean=false; ScrollAmount: Integer; implementation {$R *.lfm} { TForm1 } { note: MouseWheelDown together with MouseWheelUp achieve the same result as does MouseWheel on its own. Remove the one or the other before running the program} procedure TForm1.FormMouseWheelDown(Sender: TObject; Shift: TShiftState; MousePos: TPoint; var Handled: Boolean); var infs: PTypeInfo; ShiftList: string; // http://www.lazarusforum.de/viewtopic.php?f=18&t=8623 begin lblDirection.Caption:='Scrolling down'; ScrollAmount:=ScrollAmount-1; lblAmount.Caption:=inttostr(ScrollAmount); infs:=TypeInfo(Shift); ShiftList:=SetToString(infs,longint(Shift),true); Memo1.Caption:= ShiftList; if MouseWheelPressed then Label4.Caption:='MouseWheelPressed' else Label4.Caption:='MouseWheelUp'; end; procedure TForm1.FormMouseWheelUp(Sender: TObject; Shift: TShiftState; MousePos: TPoint; var Handled: Boolean); var infs: PTypeInfo; ShiftList: string; // http://www.lazarusforum.de/viewtopic.php?f=18&t=8623 begin lblDirection.Caption:='Scrolling up'; ScrollAmount:=ScrollAmount+1; lblAmount.Caption:=inttostr(ScrollAmount); infs:=TypeInfo(Shift); ShiftList:=SetToString(infs,longint(Shift),true); Memo1.Caption:= ShiftList; if MouseWheelPressed then Label4.Caption:='MouseWheelPressed' else Label4.Caption:='MouseWheelUp'; end; procedure TForm1.FormMouseWheel(Sender: TObject; Shift: TShiftState; WheelDelta: Integer; MousePos: TPoint; var Handled: Boolean); var infs: PTypeInfo; ShiftList: string; // http://www.lazarusforum.de/viewtopic.php?f=18&t=8623 begin { if WheelDelta<0 then lblDirection.Caption:='Scrolling down' else lblDirection.Caption:='Scrolling up'; if WheelDelta<0 then ScrollAmount:=ScrollAmount-1 else ScrollAmount:=ScrollAmount+1; lblAmount.Caption:=inttostr(ScrollAmount); infs:=TypeInfo(Shift); ShiftList:=SetToString(infs,longint(Shift),true); Memo1.Caption:= ShiftList; if MouseWheelPressed then Label4.Caption:='MouseWheelPressed' else Label4.Caption:='MouseWheelUp'; } end; procedure TForm1.FormMouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer); var infs: PTypeInfo; ShiftList: string; // http://www.lazarusforum.de/viewtopic.php?f=18&t=8623 begin infs:=TypeInfo(Shift); ShiftList:=SetToString(infs,longint(Shift),true); Memo1.Caption:= ShiftList; Label4.Caption:= 'MouseDown'; MouseWheelPressed:=true; end; procedure TForm1.FormMouseUp(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer); var infs: PTypeInfo; ShiftList: string; // http://www.lazarusforum.de/viewtopic.php?f=18&t=8623 begin infs:=TypeInfo(Shift); ShiftList:=SetToString(infs,longint(Shift),true); Memo1.Caption:= ShiftList; Label4.Caption:= 'MouseState'; MouseWheelPressed:=false; end; end.
<?xml version="1.0" encoding="UTF-8"?>
<CONFIG>
<ProjectOptions>
<Version Value="9"/>
<PathDelim Value="\"/>
<General>
<SessionStorage Value="InProjectDir"/>
<MainUnit Value="0"/>
<Title Value="proj_mouse_wheel"/>
<ResourceType Value="res"/>
<UseXPManifest Value="True"/>
<Icon Value="0"/>
</General>
<i18n>
<EnableI18N LFM="False"/>
</i18n>
<VersionInfo>
<StringTable ProductVersion=""/>
</VersionInfo>
<BuildModes Count="1">
<Item1 Name="Default" Default="True"/>
</BuildModes>
<PublishOptions>
<Version Value="2"/>
<IncludeFileFilter Value="*.(pas|pp|inc|lfm|lpr|lrs|lpi|lpk|sh|xml)"/>
<ExcludeFileFilter Value="*.(bak|ppu|o|so);*~;backup"/>
</PublishOptions>
<RunParams>
<local>
<FormatVersion Value="1"/>
</local>
</RunParams>
<RequiredPackages Count="1">
<Item1>
<PackageName Value="LCL"/>
</Item1>
</RequiredPackages>
<Units Count="2">
<Unit0>
<Filename Value="proj_mouse_wheel.lpr"/>
<IsPartOfProject Value="True"/>
</Unit0>
<Unit1>
<Filename Value="frm1.pas"/>
<IsPartOfProject Value="True"/>
<ComponentName Value="Form1"/>
<HasResources Value="True"/>
<ResourceBaseClass Value="Form"/>
</Unit1>
</Units>
</ProjectOptions>
<CompilerOptions>
<Version Value="11"/>
<PathDelim Value="\"/>
<Target>
<Filename Value="proj_mouse_wheel"/>
</Target>
<SearchPaths>
<IncludeFiles Value="$(ProjOutDir)"/>
<UnitOutputDirectory Value="lib\$(TargetCPU)-$(TargetOS)"/>
</SearchPaths>
<CodeGeneration>
<SmartLinkUnit Value="True"/>
</CodeGeneration>
<Linking>
<Debugging>
<StripSymbols Value="True"/>
<UseExternalDbgSyms Value="True"/>
</Debugging>
<LinkSmart Value="True"/>
<Options>
<Win32>
<GraphicApplication Value="True"/>
</Win32>
</Options>
</Linking>
</CompilerOptions>
<Debugging>
<Exceptions Count="3">
<Item1>
<Name Value="EAbort"/>
</Item1>
<Item2>
<Name Value="ECodetoolError"/>
</Item2>
<Item3>
<Name Value="EFOpenError"/>
</Item3>
</Exceptions>
</Debugging>
</CONFIG>
program proj_mouse_wheel;
{$mode objfpc}{$H+}
uses
{$IFDEF UNIX}{$IFDEF UseCThreads}
cthreads,
{$ENDIF}{$ENDIF}
Interfaces, // this includes the LCL widgetset
Forms, frm1
{ you can add units after this };
{$R *.res}
begin
RequireDerivedFormResource := True;
Application.Initialize;
Application.CreateForm(TForm1, Form1);
Application.Run;
end.
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<BuildModes Active="Default"/>
<Units Count="2">
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<Filename Value="proj_mouse_wheel.lpr"/>
<IsPartOfProject Value="True"/>
<UsageCount Value="27"/>
</Unit0>
<Unit1>
<Filename Value="frm1.pas"/>
<IsPartOfProject Value="True"/>
<ComponentName Value="Form1"/>
<HasResources Value="True"/>
<ResourceBaseClass Value="Form"/>
<IsVisibleTab Value="True"/>
<TopLine Value="31"/>
<CursorPos Y="54"/>
<UsageCount Value="27"/>
<Loaded Value="True"/>
<LoadedDesigner Value="True"/>
</Unit1>
</Units>
<JumpHistory Count="27" HistoryIndex="26">
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<Filename Value="frm1.pas"/>
<Caret Line="44" Column="32" TopLine="40"/>
</Position1>
<Position2>
<Filename Value="frm1.pas"/>
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Description: Binary data
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