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[[ MyPixelScale ]] Implement my pixel scale expression #6337

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livecodeali merged 1 commit into from
Feb 20, 2018
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[[ MyPixelScale ]] Implement my pixel scale expression #6337

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9 changes: 9 additions & 0 deletions docs/lcb/notes/feature-my_pixel_scale.md
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@@ -0,0 +1,9 @@
# LiveCode Builder Host Library
## Widget library

A new expression `my pixel scale` has been implemented. Use the widget's
pixel scale to calculate the size of an image to draw. For example,
when drawing an image to `my bounds` create an image sized using
`my width * my pixel scale, my height * my pixel scale` otherwise the image will be
stretched to match the pixel scale. The pixel scale is a per-window/screen property
so may change if the user moves a window to a new screen.
8 changes: 8 additions & 0 deletions engine/src/widget-syntax.cpp
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Expand Up @@ -316,6 +316,14 @@ extern "C" MC_DLLEXPORT_DEF void MCWidgetGetMyPaint(uinteger_t p_type, MCCanvasP
MCCanvasSolidPaintMakeWithColor(kMCCanvasColorBlack, (MCCanvasSolidPaintRef&)r_paint);
}

extern "C" MC_DLLEXPORT_DEF void MCWidgetGetMyPixelScale(MCCanvasFloat& r_pixel_scale)
{
if (!MCWidgetEnsureCurrentWidget())
return;

r_pixel_scale = MCWidgetGetHost(MCcurrentwidget)->getstack()->view_getbackingscale();
}

extern "C" MC_DLLEXPORT_DEF void MCWidgetGetMousePosition(bool p_current, MCCanvasPointRef& r_point)
{
if (!MCWidgetEnsureCurrentWidget())
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19 changes: 19 additions & 0 deletions engine/src/widget.lcb
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Expand Up @@ -520,6 +520,7 @@ public foreign handler MCWidgetGetMyFont(out rFont as Font) returns nothing bind
public foreign handler MCWidgetGetMyEnabled(out rEnabled as CBool) returns nothing binds to "<builtin>"
public foreign handler MCWidgetGetMyDisabled(out rDisabled as CBool) returns nothing binds to "<builtin>"
public foreign handler MCWidgetGetMyPaint(in pPaintType as CUInt, out rPaint as Paint) returns nothing binds to "<builtin>"
public foreign handler MCWidgetGetMyPixelScale(out rPixelScale as CanvasFloat) returns nothing binds to "<builtin>"

/**
Summary: Returns the widget script object.
Expand Down Expand Up @@ -654,6 +655,24 @@ begin
MCWidgetGetMyPaint(mPaintType, output)
end syntax

/**
Summary: Returns the scaling factor of pixels for the widget

Description:
Use the widget's pixel scale to calculate the size of an image to draw. For example,
when drawing an image to `my bounds` create an image sized using
`my width * my pixel scale, my height * my pixel scale` otherwise the image will be
stretched to match the pixel scale. The pixel scale is a per-window/screen property
so may change if the user moves a window to a new screen.

Returns: The current scaling factor of pixels for the widget
*/
syntax MyPixelScale is expression
"my" "pixel" "scale"
begin
MCWidgetGetMyPixelScale(output)
end syntax

// ---------- Synchronous and asynchronous ("current") event information ---------- //

//foreign type PressedState binds to "MCPressedState"
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