extended toolbar Item events using modifier keys

[Gintaras]

It is possible with a workaround or low-level code.

Code:

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// class "Toolbar_Subclass.cs"
using Au.Triggers;

partial class Program {
    [Toolbars]
    void Toolbar_Subclass_Triggers() {
        //print.clear();
        Toolbar_Subclass();
    }
    
    void Toolbar_Subclass(TriggerArgs ta = null) {
        KMod mod = 0;
        
        var t = new toolbar();
        t["LeftorRightClick"] = o => {
            print.it(mod);
        };
        t["other"] = null;
        
        t.Show(ta);
        
        WndUtil.Subclass(t.Hwnd, _WndProc);
        
        nint _WndProc(wnd w, int msg, nint wp, nint lp) {
            //WndUtil.PrintMsg(w, msg, wp, lp);
            
            switch (msg) {
            case napi.WM_LBUTTONDOWN:
                print.it("WM_LBUTTONDOWN");
                mod = keys.gui.getMod(); //save for the LeftorRightClick button code. It will run when mouse button released.
                if (!(mod is 0 or KMod.Shift)) { //0 click, Shift move. For others the button action is not called. This is a workaround.
                    if (mod.Has(KMod.Alt)) keys.more.sendKey(KKey.Alt, false);
                    if (mod.Has(KMod.Ctrl)) keys.more.sendKey(KKey.Ctrl, false);
                    if (mod.Has(KMod.Shift)) keys.more.sendKey(KKey.Shift, false);
                    if (mod.Has(KMod.Win)) keys.more.sendKey(KKey.Win, false);
                }
                break;
            case napi.WM_RBUTTONDOWN:
                print.it("WM_RBUTTONDOWN");
                break;
            case napi.WM_MBUTTONDOWN:
                print.it("WM_MBUTTONDOWN");
                //Your LeftorRightClick button code will not run on right or middle click.
                //There is no public function to get the clicked button. But it is possible.
                int i = t.GetClickedButton(lp);
                print.it("Button index: ", i);
                break;
            }
            
            //To steal a message from the toolbar, return without calling DefSubclassProc. Can return 0, or `api.DefWindowProc(w, msg, wp, lp)`, or whatever.
            //If window messages are new to you, need some learning.
            //See also _WndProc in: https://github.com/qgindi/LibreAutomate/blob/master/Au/GUI/toolbar/toolbar.cs
            
            return WndUtil.DefSubclassProc(w, msg, wp, lp);
        }
        
    }
}

static class Ext8745 {
    /// <summary>
    /// When called on a mouse button message, returns 0-based index of the clicked button.
    /// Returns -1 if not a button.
    /// Uses a private function vis reflection, therefore may stop working in the future.
    /// </summary>
    public static int GetClickedButton(this toolbar t, nint lp) {
        var p = Math2.NintToPOINT(lp);
        _HitTestD ??= typeof(toolbar).GetMethod("_HitTest", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance).CreateDelegate<_HitTestT>(t);
        return _HitTestD(p);
    }
    
    delegate int _HitTestT(POINT p);
    static _HitTestT _HitTestD;
    
}

#pragma warning disable 649, 169 //field never assigned/used
unsafe class napi : NativeApi {
    internal const ushort WM_LBUTTONDOWN = 0x201;
    internal const ushort WM_RBUTTONDOWN = 0x204;
    internal const ushort WM_MBUTTONDOWN = 0x207;
}
#pragma warning restore 649, 169 //field never assigned/used