Leadwerks GUI
Entry posted by Josh ·
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Leadwerks GUI is now functioning, on the beta branch, Windows only, Lua interpreter only.
GUI Class
static GUI* Create(Context* context)
Creates a new GUI
Widget Class
static Widget* Create(const int x, const int y, const int width, const int height, Widget* parent, const int style=0)
Creates a new Widget. Widgets can be made into buttons, dropdown boxes, or anything else by attaching a script.
virtual bool SetScript(const std::string& path, const bool start = true)
Sets a widget's script for drawing and logic
virtual void SetText(const std::string& text)
Sets a text string for the widget that can be retrieved with GetText().
The widget script will call GUI drawing commands:
virtual void DrawImage(Image* image, const int x, const int y);//lua
virtual void DrawImage(Image* image, const int x, const int y, const int width, const int height);//lua
virtual void SetColor(const float r, const float g, const float b);//lua
virtual void SetColor(const float r, const float g, const float b, const float a);//lua
virtual void DrawRect(const int x, const int y, const int width, const int height, const int fillmode = 0, const int radius = 0);//lua
virtual void DrawText(std::string& text, const int x, const int y, const int width, const int height, const int style = 0);//lua
virtual void DrawLine(const int x0, const int y0, const int x1, const int y1);//lua
Images are also supported (these are loaded from a tex file):
static Image* Load(std::string& path, GUI* gui);
Images are a little funny. If the GUI is context-based it will internally use a texture. If the GUI is window-based the image will store a bitmap that varies with the operating system. The point is, the GUI drawing commands will work the same on either.
The button script looks like this and provides a fully functional button:
Script.pushed=false
Script.hovered=false
function Script:Draw()
--System:Print("Paint Button")
local pos = self.widget:GetPosition(true)
local gui = self.widget:GetGUI()
gui:SetColor(1,1,1,1)
if self.pushed then
gui:SetColor(0.2,0.2,0.2)
else
if self.hovered then
gui:SetColor(0.3,0.3,0.3)
else
gui:SetColor(0.25,0.25,0.25)
end
end
gui:DrawRect(pos.x,pos.y,self.widget.size.width,self.widget.size.height,0,3)
gui:SetColor(0.9,0.9,0.9)
local text = self.widget:GetText()
if text~="" then
if self.pushed then
gui:DrawText(text,pos.x+1,pos.y+1,self.widget.size.width,self.widget.size.height,Text.Center+Text.VCenter)
else
gui:DrawText(text,pos.x,pos.y,self.widget.size.width,self.widget.size.height,Text.Center+Text.VCenter)
end
end
gui:DrawRect(pos.x,pos.y,self.widget.size.width,self.widget.size.height,1,3)
end
function Script:MouseEnter(x,y)
self.hovered = true
self.widget:Redraw()
end
function Script:MouseLeave(x,y)
self.hovered = false
self.widget:Redraw()
end
function Script:MouseMove(x,y)
--System:Print("MouseMove")
end
function Script:MouseDown(button,x,y)
--System:Print("MouseDown")
self.pushed=true
self.widget:Redraw()
end
function Script:MouseUp(button,x,y)
--System:Print("MouseUp")
local gui = self.widget:GetGUI()
self.pushed=false
if self.hovered then
EventQueue:Emit(Event.WidgetAction,self.widget)
end
self.widget:Redraw()
end
function Script:KeyDown(button,x,y)
--System:Print("KeyDown")
end
function Script:KeyUp(button,x,y)
--System:Print("KeyUp")
end
The button uses the new EventQueue class to emit an event:
EventQueue:Emit(Event.WidgetAction,self.widget)
The main script can then poll events and find out when the button is pushed. This code is inserted into the main loop to do that:
while EventQueue:Peek() do
local event = EventQueue:Wait()
if event.id == Event.WidgetAction then
if event.source == button then
System:Print("The button was pressed!")
end
end
end
Support for event callbacks will also be added.
The full main script to create a GUI and handle events looks like this:
--Initialize Steamworks (optional)
Steamworks:Initialize()
--Set the application title
title="$PROJECT_TITLE"
--Create a window
local windowstyle = window.Titlebar + window.Resizable-- + window.Hidden
if System:GetProperty("fullscreen")=="1" then windowstyle=windowstyle+window.FullScreen end
window=Window:Create(title,0,0,System:GetProperty("screenwidth","1024"),System:GetProperty("screenheight","768"),windowstyle)
--window:HideMouse()
--Create the graphics context
context=Context:Create(window)
if context==nil then return end
--Create a GUI
local gui = GUI:Create(context)
--Create a new widget
local button = Widget:Create(20,20,300,50,gui:GetBase())
--Set the widget's script to make it a button
button:SetScript("Scripts/GUI/Button.lua")
--Set the button text
button:SetText("Button")
--Create a world
world=World:Create()
world:SetLightQuality((System:GetProperty("lightquality","1")))
--Load a map
local mapfile = System:GetProperty("map","Maps/start.map")
if Map:Load(mapfile)==false then return end
--window:Show()
while window:KeyDown(Key.Escape)==false do
--Process events
while EventQueue:Peek() do
local event = EventQueue:Wait()
if event.id == Event.WidgetAction then
if event.source == button then
System:Print("The button was pressed!")
end
end
end
--If window has been closed, end the program
if window:Closed() then break end
--Handle map change
if changemapname~=nil then
--Clear all entities
world:Clear()
--Load the next map
Time:Pause()
if Map:Load("Maps/"..changemapname..".map")==false then return end
Time:Resume()
changemapname = nil
end
--Update the app timing
Time:Update()
--Update the world
world:Update()
--Render the world
world:Render()
--Render statistics
context:SetBlendMode(Blend.Alpha)
if DEBUG then
context:SetColor(1,0,0,1)
context:DrawText("Debug Mode",2,2)
context:SetColor(1,1,1,1)
context:DrawStats(2,22)
context:SetBlendMode(Blend.Solid)
else
--Toggle statistics on and off
if (window:KeyHit(Key.F11)) then showstats = not showstats end
if showstats then
context:SetColor(1,1,1,1)
context:DrawText("FPS: "..Math:Round(Time:UPS()),2,2)
end
end
--Refresh the screen
context:Sync(true)
end
At this point the system contains everything you need to begin writing your own widget scripts. Small changes may occur in the API before the feature is finalized, but this is pretty close to the final product.
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