9/26/2023 0 Comments Change movist background color![]() ![]() SolidBrush backBrush = new SolidBrush(BackColor) Using (var g = Graphics.FromHwnd(m.HWnd)) Private Color _backColor = Color.FromArgb(31, 31, 31) Ignore to prevent flickering in DesignMode. Protected override void WndProc(ref Message m) Private BufferedGraphicsContext _bufferContext = BufferedGraphicsManager.Current WM_PAINT is called frequently so it's better to declare it as a member. Cache context to avoid repeatedly re-creating the object. Private const int WM_ERASEBKGND = 0x0014 Simply omit it during DesignMode: private const int WM_PAINT = 0x000F This is easily avoided by also checking for the WM_ERASEBKGND message. Your TabControl will flicker in design mode. ![]() _tabItemStateMap.Add(e.Index, new TabItemInfo(e)) If (!_tabItemStateMap.ContainsKey(e.Index)) Use the OnDrawItem(DrawItemEventArgs) method instead: protected override void OnDrawItem(DrawItemEventArgs e) Private Dictionary _tabItemStateMap = new Dictionary() ĭon't assign an event handler when you are already deriving from the Control itself. Instead, consider using a struct like this: private struct TabItemInfo Net 4.5 and above and is also not needed. I don't know in which Version the code was written but storing the Graphics object of the TabItem will not work in 2023 under. Simply override the property in your derived TabControl class like this: public new TabDrawMode DrawModeīase.DrawMode = TabDrawMode.OwnerDrawFixed The DrawMode property of the TabControl has to be set to TabDrawMode.OwnerDrawFixed otherwise the DrawItem event handler won't fire. This solution is not optimal but it works and its the only thing you can do to get more control over TabControl (lol) without painting it from scratch.Īdding to answer because it is missing some crucial parts to actually make it work. So, in a nutshell we are intercepting the Drawing of tab headers to delay it until we are finished drawing the background. It calls a method where I am painting the tab headers which takes the DrawItemEventArgs which we saved before as a parameter to paint the items in correct state and position. Thats where the foreach from a few seconds ago comes into play. I am saving the DrawItemEventArgs into a dictionary (which is called "ItemArgs" in my case) so I can access them later. Save information about item in dictionary but dont do actual drawing To solve this I made an EventHandler for DrawItem which looks as the following: private void DrawItemHandler(object sender, DrawItemEventArgs e) The Problem is that TabControl paints its items (the tab headers) before its own WM_PAINT so our background will be drawn on top, which renders them invisible. Im doing further drawing in this method so it looks a little overkill for this problem but just ignore the unnecessary stuff.Īlso notice the foreach loop. Actual painting of items after Background was painted R.Height = +1 //Using display rectangle hight because it excludes the tab headers already Using (Graphics g = this.CreateGraphics())ĬurrentContext = BufferedGraphicsManager.Current protected override void WndProc(ref Message m) In there we go ahead and paint our background with the color we like. So far so good but now it gets dirty.īecause TabControl won't call OnPaint, we have do override WndProc to handle the WM_PAINT message. To try javascript, i tried to do an alert : JavaScript.getCurrent().execute("alert('Hi SO!')") but it did not work, and i wonder why.First of all you need to make a deriving class from TabControl. I also tried with JavaScript.getCurrent().execute("$('.backColorGrey').css('background-color', 'grey')") īut nothing to do, the color remains the same, it never changed. v-horizontallayout-backColorGrey as class name in css. In one of my apps, i created a footer : public Footer() in my theme.
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