#region Imports
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using DPumpHydr.WinFrmUI.RLT.Child.Metro;
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using DPumpHydr.WinFrmUI.RLT.Controls;
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using DPumpHydr.WinFrmUI.RLT.Native;
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using System;
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using System.Collections;
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using System.ComponentModel;
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using System.ComponentModel.Design;
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using System.Drawing;
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using System.Runtime.InteropServices;
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using System.Windows.Forms;
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using System.Windows.Forms.Design;
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#endregion
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namespace DPumpHydr.WinFrmUI.RLT.Design.Metro
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{
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#region MetroTabControlDesignerDesign
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public class MetroTabControlDesigner : ParentControlDesigner
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{
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#region Instance Members
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private DesignerVerbCollection _verbs;
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private IDesignerHost _designerHost;
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private IComponentChangeService _changeService;
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#endregion Instance Members
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#region Constructor
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#endregion Constructor
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#region Property
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public override DesignerVerbCollection Verbs
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{
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get
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{
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if (_verbs == null)
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{
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DesignerVerb[] addVerbs = new[]
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{
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new DesignerVerb("Add Tab", OnAddTab),
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new DesignerVerb("Remove Tab", OnRemoveTab)
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};
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_verbs = new();
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_verbs.AddRange(addVerbs);
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if (Control is not MetroTabControl parentControl)
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{
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return _verbs;
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}
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_verbs[1].Enabled = parentControl.TabPages.Count switch
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{
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0 => false,
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_ => true,
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};
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}
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return _verbs;
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}
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}
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#endregion Property
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#region Override Methods
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public override void Initialize(IComponent component)
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{
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base.Initialize(component);
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_designerHost = (IDesignerHost)GetService(typeof(IDesignerHost));
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_changeService = (IComponentChangeService)GetService(typeof(IComponentChangeService));
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if (_changeService != null)
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{
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_changeService.ComponentChanged += OnComponentChanged;
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}
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}
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protected override void PostFilterProperties(IDictionary properties)
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{
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properties.Remove("Margin");
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properties.Remove("ImeMode");
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properties.Remove("Padding");
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properties.Remove("Enabled");
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properties.Remove("RightToLeft");
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properties.Remove("RightToLeftLayout");
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properties.Remove("ApplicationSettings");
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properties.Remove("DataBindings");
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base.PostFilterProperties(properties);
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}
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protected override void WndProc(ref Message m)
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{
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base.WndProc(ref m);
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if (m.Msg == (int)User32.Msgs.WM_NCHITTEST)
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{
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if (m.Result.ToInt32() == User32._HT_TRANSPARENT)
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{
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m.Result = (IntPtr)User32._HTCLIENT;
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}
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}
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}
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protected override bool GetHitTest(Point point)
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{
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ISelectionService selectionService = (ISelectionService)GetService(typeof(ISelectionService));
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object selectedObject = selectionService?.PrimarySelection;
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if (selectedObject != null && selectedObject.Equals(Control))
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{
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Point p = Control.PointToClient(point);
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User32.TCHITTESTINFO hti = new(p, User32.TabControlHitTest.TCHT_ONITEM);
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Message m = new()
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{
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HWnd = Control.Handle,
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Msg = User32._TCM_HITTEST
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};
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IntPtr lParam = Marshal.AllocHGlobal(Marshal.SizeOf(hti));
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Marshal.StructureToPtr(hti, lParam, false);
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m.LParam = lParam;
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base.WndProc(ref m);
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Marshal.FreeHGlobal(lParam);
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if (m.Result.ToInt32() != -1)
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{
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return hti.flags != User32.TabControlHitTest.TCHT_NOWHERE;
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}
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}
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return false;
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}
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protected override void Dispose(bool disposing)
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{
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if (disposing && _changeService != null)
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{
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_changeService.ComponentChanged -= OnComponentChanged;
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}
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base.Dispose(disposing);
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}
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#endregion Override Methods
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#region Helper Methods
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private void OnAddTab(object sender, EventArgs e)
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{
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MetroTabControl parentControl = Control as MetroTabControl;
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TabControl.TabPageCollection oldTabs = parentControl?.TabPages;
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RaiseComponentChanging(TypeDescriptor.GetProperties(parentControl)["TabPages"]);
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MetroTabPage newTab = (MetroTabPage)_designerHost.CreateComponent(typeof(MetroTabPage));
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newTab.Text = newTab.Name;
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parentControl?.TabPages.Add(newTab);
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if (parentControl == null)
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{
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return;
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}
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parentControl.SelectedTab = newTab;
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RaiseComponentChanged(TypeDescriptor.GetProperties(parentControl)["TabPages"], oldTabs, parentControl.TabPages);
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}
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private void OnRemoveTab(object sender, EventArgs e)
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{
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MetroTabControl parentControl = Control as MetroTabControl;
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if (parentControl != null && parentControl.SelectedIndex < 0)
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{
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return;
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}
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TabControl.TabPageCollection oldTabs = parentControl?.TabPages;
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RaiseComponentChanging(TypeDescriptor.GetProperties(parentControl)["TabPages"]);
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_designerHost.DestroyComponent(parentControl?.SelectedTab);
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RaiseComponentChanged(TypeDescriptor.GetProperties(parentControl)["TabPages"], oldTabs, parentControl?.TabPages);
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}
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private void OnComponentChanged(object sender, ComponentChangedEventArgs e)
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{
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if (e.Component is not MetroTabControl parentControl || e.Member.Name != "TabPages")
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{
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return;
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}
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foreach (DesignerVerb verb in Verbs)
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{
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if (verb.Text != "Remove Tab")
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{
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continue;
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}
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verb.Enabled = parentControl.TabPages.Count switch
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{
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0 => false,
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_ => true,
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};
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break;
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}
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}
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#endregion Helper Methods
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}
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#endregion
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}
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