Package com.formdev.flatlaf.util

Class HiDPIUtils

java.lang.Object

com.formdev.flatlaf.util.HiDPIUtils

public class HiDPIUtils
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	HiDPIUtils.DirtyRegionCallback	For addDirtyRegion(JComponent, int, int, int, int, DirtyRegionCallback).
static class	HiDPIUtils.HiDPIRepaintManager	A repaint manager that fixes a problem in Swing when repainting components at some scale factors (e.g.
static interface	HiDPIUtils.Painter

Constructor Summary

Constructors

Constructor	Description
HiDPIUtils()

Method Summary

Modifier and Type	Method	Description
static void	addDirtyRegion(JComponent c, int x, int y, int width, int height, HiDPIUtils.DirtyRegionCallback callback)	Similar to repaint(Component, int, int, int, int), but invokes callback instead of invoking Component.repaint(int, int, int, int).
static float	computeTextYCorrection(Graphics2D g)	When painting text on HiDPI screens and the JRE scales, then the text is painted too far down on some operating systems.
static Graphics2D	createGraphicsTextYCorrection(Graphics2D g)	Creates a graphics object and applies Y correction to string drawing methods.
static void	drawStringUnderlineCharAtWithYCorrection(JComponent c, Graphics2D g, String text, int underlinedIndex, int x, int y)	Applies Y correction and draws the given string at the specified location underlining the specified character.
static void	drawStringWithYCorrection(JComponent c, Graphics2D g, String text, int x, int y)	Applies Y correction and draws the given string at the specified location.
static void	installHiDPIRepaintManager()	Installs a HiDPIUtils.HiDPIRepaintManager on Windows when running in Java 9+, but only if default repaint manager is currently installed.
static void	paintAtScale1x(Graphics2D g, int x, int y, int width, int height, HiDPIUtils.Painter painter)	Paint at system scale factor 1x to avoid rounding issues at 125%, 150% and 175% scaling.
static void	paintAtScale1x(Graphics2D g, JComponent c, HiDPIUtils.Painter painter)
static void	repaint(Component c)	Repaints the given component.
static void	repaint(Component c, int x, int y, int width, int height)	Repaints the given component area.
static void	repaint(Component c, Rectangle r)	Repaints the given component area.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

HiDPIUtils

public HiDPIUtils()

Method Detail

paintAtScale1x

public static void paintAtScale1x(Graphics2D g,
                                  JComponent c,
                                  HiDPIUtils.Painter painter)

paintAtScale1x

public static void paintAtScale1x(Graphics2D g,
                                  int x,
                                  int y,
                                  int width,
                                  int height,
                                  HiDPIUtils.Painter painter)

Paint at system scale factor 1x to avoid rounding issues at 125%, 150% and 175% scaling.

Scales the given Graphics2D down to 100% and invokes the given painter passing scaled x, y, width and height.

Uses the same scaling calculation as the JRE uses.

computeTextYCorrection

public static float computeTextYCorrection(Graphics2D g)

When painting text on HiDPI screens and the JRE scales, then the text is painted too far down on some operating systems. The higher the system scale factor is, the more.

This method computes a correction value for the Y position.

drawStringWithYCorrection

public static void drawStringWithYCorrection(JComponent c,
                                             Graphics2D g,
                                             String text,
                                             int x,
                                             int y)

Applies Y correction and draws the given string at the specified location. The provided component is used to query text properties and anti-aliasing hints.

Use this method instead of Graphics.drawString(String, int, int) for correct anti-aliasing.

Replacement for SwingUtilities2.drawString().

drawStringUnderlineCharAtWithYCorrection

public static void drawStringUnderlineCharAtWithYCorrection(JComponent c,
                                                            Graphics2D g,
                                                            String text,
                                                            int underlinedIndex,
                                                            int x,
                                                            int y)

Applies Y correction and draws the given string at the specified location underlining the specified character. The provided component is used to query text properties and anti-aliasing hints.

Replacement for SwingUtilities2.drawStringUnderlineCharAt().

createGraphicsTextYCorrection

public static Graphics2D createGraphicsTextYCorrection(Graphics2D g)

Creates a graphics object and applies Y correction to string drawing methods. If no Y correction is necessary, the passed in graphics object is returned.

repaint

public static void repaint(Component c)

Repaints the given component.

See repaint(Component, int, int, int, int) for more details.

Since:

3.5

repaint

public static void repaint(Component c,
                           Rectangle r)

Repaints the given component area.

See repaint(Component, int, int, int, int) for more details.

Since:

3.5

repaint

public static void repaint(Component c,
                           int x,
                           int y,
                           int width,
                           int height)

Repaints the given component area.

Invokes Component.repaint(int, int, int, int) on the given component,

Use this method, instead of Component.repaint(...), to fix a problem in Swing when using scale factors that end on .25 or .75 (e.g. 1.25, 1.75, 2.25, etc) and repainting single components, which may not repaint right and/or bottom 1px edge of component.

The problem may occur under following conditions:

• using Java 9 or later
• system scale factor is 125%, 175%, 225%, ... (Windows only; Java on macOS and Linux does not support fractional scale factors)
• repaint whole component or right/bottom area of component
• component is opaque; or component is contained in a opaque container that has same right/bottom bounds as component
• component has bounds that Java/Swing scales different when repainting components

Since:

3.5

installHiDPIRepaintManager

public static void installHiDPIRepaintManager()

Installs a HiDPIUtils.HiDPIRepaintManager on Windows when running in Java 9+, but only if default repaint manager is currently installed.

Invoke once on application startup. Compatible with all/other LaFs.

Since:

3.5

addDirtyRegion

public static void addDirtyRegion(JComponent c,
                                  int x,
                                  int y,
                                  int width,
                                  int height,
                                  HiDPIUtils.DirtyRegionCallback callback)

Similar to repaint(Component, int, int, int, int), but invokes callback instead of invoking Component.repaint(int, int, int, int).

For use in custom repaint managers.

Since:

3.5