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lua/vgui/dvscrollbar.lua
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308
lua/vgui/dvscrollbar.lua
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--[[
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| This file was obtained through the combined efforts
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| of Madbluntz & Plymouth Antiquarian Society.
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| Credits: lifestorm, Gregory Wayne Rossel JR.,
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| Maloy, DrPepper10 @ RIP, Atle!
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| Visit for more: https://plymouth.thetwilightzone.ru/
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--]]
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--[[
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DVScrollBar
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Usage:
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Place this control in your panel. You will ideally have another panel or
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control which is bigger than the original panel. This is the Canvas.
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scrollbar:SetUp( _barsize_, _canvassize_ ) should be called whenever
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the size of your 'canvas' changes.
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scrollbar:GetOffset() can be called to get the offset of the canvas.
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You should call this in your PerformLayout function and set the Y
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pos of your canvas to this value.
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Example:
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function PANEL:PerformLayout()
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local Wide = self:GetWide()
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local YPos = 0
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-- Place the scrollbar
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self.VBar:SetPos( self:GetWide() - 16, 0 )
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self.VBar:SetSize( 16, self:GetTall() )
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-- Make sure the scrollbar knows how big our canvas is
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self.VBar:SetUp( self:GetTall(), self.pnlCanvas:GetTall() )
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-- Get data from the scrollbar
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YPos = self.VBar:GetOffset()
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-- If the scrollbar is enabled make the canvas thinner so it will fit in.
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if ( self.VBar.Enabled ) then Wide = Wide - 16 end
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-- Position the canvas according to the scrollbar's data
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self.pnlCanvas:SetPos( self.Padding, YPos + self.Padding )
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self.pnlCanvas:SetSize( Wide - self.Padding * 2, self.pnlCanvas:GetTall() )
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end
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--]]
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local PANEL = {}
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AccessorFunc( PANEL, "m_HideButtons", "HideButtons" )
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function PANEL:Init()
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self.Offset = 0
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self.Scroll = 0
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self.CanvasSize = 1
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self.BarSize = 1
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self.btnUp = vgui.Create( "DButton", self )
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self.btnUp:SetText( "" )
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self.btnUp.DoClick = function( s ) s:GetParent():AddScroll( -1 ) end
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self.btnUp.Paint = function( panel, w, h ) derma.SkinHook( "Paint", "ButtonUp", panel, w, h ) end
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self.btnDown = vgui.Create( "DButton", self )
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self.btnDown:SetText( "" )
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self.btnDown.DoClick = function( s ) s:GetParent():AddScroll( 1 ) end
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self.btnDown.Paint = function( panel, w, h ) derma.SkinHook( "Paint", "ButtonDown", panel, w, h ) end
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self.btnGrip = vgui.Create( "DScrollBarGrip", self )
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self:SetSize( 15, 15 )
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self:SetHideButtons( false )
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end
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function PANEL:SetEnabled( b )
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if ( !b ) then
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self.Offset = 0
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self:SetScroll( 0 )
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self.HasChanged = true
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end
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self:SetMouseInputEnabled( b )
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self:SetVisible( b )
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-- We're probably changing the width of something in our parent
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-- by appearing or hiding, so tell them to re-do their layout.
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if ( self.Enabled != b ) then
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self:GetParent():InvalidateLayout()
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if ( self:GetParent().OnScrollbarAppear ) then
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self:GetParent():OnScrollbarAppear()
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end
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end
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self.Enabled = b
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end
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function PANEL:BarScale()
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if ( self.BarSize == 0 ) then return 1 end
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return self.BarSize / ( self.CanvasSize + self.BarSize )
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end
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function PANEL:SetUp( _barsize_, _canvassize_ )
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self.BarSize = _barsize_
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self.CanvasSize = math.max( _canvassize_ - _barsize_, 1 )
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self:SetEnabled( _canvassize_ > _barsize_ )
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self:InvalidateLayout()
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end
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function PANEL:OnMouseWheeled( dlta )
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if ( !self:IsVisible() ) then return false end
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-- We return true if the scrollbar changed.
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-- If it didn't, we feed the mousehweeling to the parent panel
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return self:AddScroll( dlta * -2 )
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end
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function PANEL:AddScroll( dlta )
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local OldScroll = self:GetScroll()
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dlta = dlta * 25
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self:SetScroll( self:GetScroll() + dlta )
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return OldScroll != self:GetScroll()
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end
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function PANEL:SetScroll( scrll )
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if ( !self.Enabled ) then self.Scroll = 0 return end
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self.Scroll = math.Clamp( scrll, 0, self.CanvasSize )
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self:InvalidateLayout()
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-- If our parent has a OnVScroll function use that, if
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-- not then invalidate layout (which can be pretty slow)
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local func = self:GetParent().OnVScroll
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if ( func ) then
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func( self:GetParent(), self:GetOffset() )
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else
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self:GetParent():InvalidateLayout()
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end
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end
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function PANEL:AnimateTo( scrll, length, delay, ease )
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local anim = self:NewAnimation( length, delay, ease )
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anim.StartPos = self.Scroll
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anim.TargetPos = scrll
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anim.Think = function( anm, pnl, fraction )
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pnl:SetScroll( Lerp( fraction, anm.StartPos, anm.TargetPos ) )
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end
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end
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function PANEL:GetScroll()
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if ( !self.Enabled ) then self.Scroll = 0 end
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return self.Scroll
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end
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function PANEL:GetOffset()
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if ( !self.Enabled ) then return 0 end
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return self.Scroll * -1
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end
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function PANEL:Think()
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end
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function PANEL:Paint( w, h )
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derma.SkinHook( "Paint", "VScrollBar", self, w, h )
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return true
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end
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function PANEL:OnMousePressed()
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local x, y = self:CursorPos()
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local PageSize = self.BarSize
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if ( y > self.btnGrip.y ) then
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self:SetScroll( self:GetScroll() + PageSize )
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else
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self:SetScroll( self:GetScroll() - PageSize )
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end
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end
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function PANEL:OnMouseReleased()
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self.Dragging = false
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self.DraggingCanvas = nil
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self:MouseCapture( false )
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self.btnGrip.Depressed = false
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end
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function PANEL:OnCursorMoved( lx, ly )
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if ( !self.Enabled ) then return end
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if ( !self.Dragging ) then return end
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local x, y = self:ScreenToLocal( 0, gui.MouseY() )
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-- Uck.
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y = y - self.btnUp:GetTall()
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y = y - self.HoldPos
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local BtnHeight = self:GetWide()
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if ( self:GetHideButtons() ) then BtnHeight = 0 end
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local TrackSize = self:GetTall() - BtnHeight * 2 - self.btnGrip:GetTall()
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y = y / TrackSize
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self:SetScroll( y * self.CanvasSize )
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end
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function PANEL:Grip()
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if ( !self.Enabled ) then return end
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if ( self.BarSize == 0 ) then return end
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self:MouseCapture( true )
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self.Dragging = true
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local x, y = self.btnGrip:ScreenToLocal( 0, gui.MouseY() )
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self.HoldPos = y
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self.btnGrip.Depressed = true
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end
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function PANEL:PerformLayout()
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local Wide = self:GetWide()
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local BtnHeight = Wide
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if ( self:GetHideButtons() ) then BtnHeight = 0 end
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local Scroll = self:GetScroll() / self.CanvasSize
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local BarSize = math.max( self:BarScale() * ( self:GetTall() - ( BtnHeight * 2 ) ), 10 )
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local Track = self:GetTall() - ( BtnHeight * 2 ) - BarSize
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Track = Track + 1
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Scroll = Scroll * Track
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self.btnGrip:SetPos( 0, BtnHeight + Scroll )
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self.btnGrip:SetSize( Wide, BarSize )
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if ( BtnHeight > 0 ) then
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self.btnUp:SetPos( 0, 0 )
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self.btnUp:SetSize( Wide, BtnHeight )
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self.btnDown:SetPos( 0, self:GetTall() - BtnHeight )
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self.btnDown:SetSize( Wide, BtnHeight )
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self.btnUp:SetVisible( true )
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self.btnDown:SetVisible( true )
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else
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self.btnUp:SetVisible( false )
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self.btnDown:SetVisible( false )
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self.btnDown:SetSize( Wide, BtnHeight )
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self.btnUp:SetSize( Wide, BtnHeight )
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end
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end
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derma.DefineControl( "DVScrollBar", "A Scrollbar", PANEL, "Panel" )
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