SWT helper refactor:

- move out of StateComposite to its own SWTUtils class
- refactor to reflection (better than one overload for each SWT type...)

1 files changed, 106 insertions, 0 deletions

diff --git a/pdf-over-gui/src/main/java/at/asit/pdfover/gui/utils/SWTUtils.java b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/utils/SWTUtils.java
new file mode 100644
index 00000000..9b37117b
--- /dev/null
+++ b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/utils/SWTUtils.java
@@ -0,0 +1,106 @@
+package at.asit.pdfover.gui.utils;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+import org.eclipse.swt.graphics.Font;
+import org.eclipse.swt.graphics.FontData;
+import org.eclipse.swt.layout.FormAttachment;
+import org.eclipse.swt.layout.FormData;
+import org.eclipse.swt.widgets.Control;
+import org.eclipse.swt.widgets.Event;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import at.asit.pdfover.commons.Messages;
+import at.asit.pdfover.gui.composites.StateComposite;
+
+public final class SWTUtils {
+
+    private static final Logger log = LoggerFactory.getLogger(SWTUtils.class);
+
+    /* oh how i miss C++, and compile-time safety; this would be so much cleaner as a templated function */
+    private static void genericSetText(Object swtObj, String text) {
+    	try {
+    		Method m = swtObj.getClass().getMethod("setText", String.class);
+    		m.invoke(swtObj, text);
+    	} catch (NoSuchMethodException | IllegalAccessException e) {
+    		log.error("Attempted to setLocalizedText on object of type {}, which does not have an accessible setText method", swtObj.getClass().getSimpleName(), e);
+    	} catch (InvocationTargetException e) {
+    		log.error("Failed to setLocalizedText on object of type {}", swtObj.getClass().getSimpleName(), e);
+    	}
+    
+    	try {
+    		// request re-layout if possible, changing the text content will change the bounding box
+    		Method m = swtObj.getClass().getMethod("requestLayout");
+    		m.invoke(swtObj);
+    	} catch (NoSuchMethodException | IllegalAccessException e) {
+    		// do nothing, this may not exist on every control we use
+    	} catch (InvocationTargetException e) {
+    		log.error("Failed to re-layout {}", swtObj.getClass().getSimpleName(), e);
+    	}
+    }
+
+    public static void setLocalizedText(Object o, String messageKey) { genericSetText(o, Messages.getString(messageKey)); }
+    public static void setLocalizedText(Object o, String formatMessageKey, Object... formatArgs) { genericSetText(o, String.format(Messages.getString(formatMessageKey), formatArgs)); }
+
+    public static void disableEventDefault(Control c, int event) {
+    	c.addListener(event, (Event e) -> { e.doit = false; });
+    }
+
+    public static void setFontHeight(Control c, int height) {
+    	FontData[] fD = c.getFont().getFontData();
+    	fD[0].setHeight(height);
+    	Font font = new Font(c.getDisplay(), fD[0]);
+    	c.setFont(font);
+    }
+
+    public static void setFontStyle(Control c, int style) {
+    	FontData[] fD = c.getFont().getFontData();
+    	fD[0].setStyle(style);
+    	Font font = new Font(c.getDisplay(), fD[0]);
+    	c.setFont(font);
+    }
+
+    public static class AnchorSetter {
+    	private final Control c;
+    	private final FormData fd = new FormData();
+    	private AnchorSetter(Control c) { this.c = c; }
+    
+    	public void set() { this.c.setLayoutData(this.fd); }
+    
+    	public AnchorSetter height(int h) { fd.height = h; return this; }
+    	public AnchorSetter width(int w) { fd.width = w; return this; }
+    
+    	public AnchorSetter top(FormAttachment a) { fd.top = a; return this; }
+    	public AnchorSetter left(FormAttachment a) { fd.left = a; return this; }
+    	public AnchorSetter right(FormAttachment a) { fd.right = a; return this; }
+    	public AnchorSetter bottom(FormAttachment a) { fd.bottom = a; return this; }
+    
+    	public AnchorSetter top(Control control, int offset, int alignment) { return top(new FormAttachment(control, offset, alignment)); }
+    	public AnchorSetter top(Control control, int offset) { return top(new FormAttachment(control, offset)); }
+    	public AnchorSetter top(Control control) { return top(new FormAttachment(control)); }
+    	public AnchorSetter top(int num, int offset) { return top(new FormAttachment(num, offset)); }
+    	public AnchorSetter top(int num) { return top(new FormAttachment(num)); }
+    
+    	public AnchorSetter left(Control control, int offset, int alignment) { return left(new FormAttachment(control, offset, alignment)); }
+    	public AnchorSetter left(Control control, int offset) { return left(new FormAttachment(control, offset)); }
+    	public AnchorSetter left(Control control) { return left(new FormAttachment(control)); }
+    	public AnchorSetter left(int num, int offset) { return left(new FormAttachment(num, offset)); }
+    	public AnchorSetter left(int num) { return left(new FormAttachment(num)); }
+    
+    	public AnchorSetter right(Control control, int offset, int alignment) { return right(new FormAttachment(control, offset, alignment)); }
+    	public AnchorSetter right(Control control, int offset) { return right(new FormAttachment(control, offset)); }
+    	public AnchorSetter right(Control control) { return right(new FormAttachment(control)); }
+    	public AnchorSetter right(int num, int offset) { return right(new FormAttachment(num, offset)); }
+    	public AnchorSetter right(int num) { return right(new FormAttachment(num)); }
+    
+    	public AnchorSetter bottom(Control control, int offset, int alignment) { return bottom(new FormAttachment(control, offset, alignment)); }
+    	public AnchorSetter bottom(Control control, int offset) { return bottom(new FormAttachment(control, offset)); }
+    	public AnchorSetter bottom(Control control) { return bottom(new FormAttachment(control)); }
+    	public AnchorSetter bottom(int num, int offset) { return bottom(new FormAttachment(num, offset)); }
+    	public AnchorSetter bottom(int num) { return bottom(new FormAttachment(num)); }
+    }
+    public static AnchorSetter anchor(Control c) { return new AnchorSetter(c); }
+    
+}