129 lines
4.0 KiB
Lua
129 lines
4.0 KiB
Lua
-- Text rendering example.
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-- Displays text at various sizes, with checkboxes to change the rendering parameters.
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require "LuaScripts/Utilities/Sample"
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-- Tag used to find all Text elements
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local TEXT_TAG = "Typography_text_tag"
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-- Top-level container for this sample's UI
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local uielement = nil
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function Start()
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-- Execute the common startup for samples
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SampleStart()
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-- Enable OS cursor
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input.mouseVisible = true
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-- Load XML file containing default UI style sheet
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local style = cache:GetResource("XMLFile", "UI/DefaultStyle.xml")
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-- Set the loaded style as default style
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ui.root.defaultStyle = style
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-- Create a UIElement to hold all our content
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-- (Don't modify the root directly, as the base Sample class uses it)
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uielement = UIElement:new()
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uielement:SetAlignment(HA_CENTER, VA_CENTER)
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uielement:SetLayout(LM_VERTICAL, 20, IntRect(20, 40, 20, 40))
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ui.root:AddChild(uielement)
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-- Add some sample text
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CreateText()
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-- Add a checkbox to toggle the background color.
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CreateCheckbox("White background", "HandleWhiteBackground")
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-- Add a checkbox for the global ForceAutoHint setting. This affects character spacing.
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CreateCheckbox("UI::SetForceAutoHint", "HandleForceAutoHint")
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-- Add a checkbox to toggle SRGB output conversion (if available).
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-- This will give more correct text output for FreeType fonts, as the FreeType rasterizer
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-- outputs linear coverage values rather than SRGB values. However, this feature isn't
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-- available on all platforms.
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CreateCheckbox("Graphics::SetSRGB", "HandleSRGB")
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-- Set the mouse mode to use in the sample
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SampleInitMouseMode(MM_FREE)
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end
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function CreateText()
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local container = UIElement:new()
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container:SetAlignment(HA_LEFT, VA_TOP)
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container:SetLayout(LM_VERTICAL)
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uielement:AddChild(container)
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local font = cache:GetResource("Font", "Fonts/BlueHighway.ttf")
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for size = 1, 24 do
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local text = Text:new()
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text.text = "The quick brown fox jumps over the lazy dog (" .. size .. "pt)"
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text:SetFont(font, size)
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text:AddTag(TEXT_TAG)
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container:AddChild(text)
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end
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end
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function CreateCheckbox(label, handler)
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local container = UIElement:new()
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container:SetAlignment(HA_LEFT, VA_TOP)
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container:SetLayout(LM_HORIZONTAL, 8)
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uielement:AddChild(container)
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local box = CheckBox:new()
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container:AddChild(box)
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box:SetStyleAuto()
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local text = Text:new()
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container:AddChild(text)
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text.text = label
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text:SetStyleAuto()
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text:AddTag(TEXT_TAG)
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SubscribeToEvent(box, "Toggled", handler)
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end
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function HandleWhiteBackground(eventType, eventData)
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local box = eventData["Element"]:GetPtr("CheckBox")
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local checked = box:IsChecked()
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local fg = checked and Color.BLACK or Color.WHITE
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local bg = checked and Color.WHITE or Color.BLACK
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renderer.defaultZone.fogColor = bg
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local elements = uielement:GetChildrenWithTag(TEXT_TAG, true)
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for i, element in ipairs(elements) do
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element.color = fg
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end
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end
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function HandleForceAutoHint(eventType, eventData)
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local box = eventData["Element"]:GetPtr("CheckBox")
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local checked = box:IsChecked()
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ui:SetForceAutoHint(checked)
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end
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function HandleSRGB(eventType, eventData)
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local box = eventData["Element"]:GetPtr("CheckBox")
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local checked = box:IsChecked()
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if graphics:GetSRGBWriteSupport() then
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graphics:SetSRGB(checked)
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else
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log:Write(LOG_WARNING, "graphics:GetSRGBWriteSupport returned false")
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end
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end
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-- Create XML patch instructions for screen joystick layout specific to this sample app
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function GetScreenJoystickPatchString()
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return
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"<patch>" ..
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" <add sel=\"/element/element[./attribute[@name='Name' and @value='Hat0']]\">" ..
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" <attribute name=\"Is Visible\" value=\"false\" />" ..
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" </add>" ..
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"</patch>"
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end
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