package at.asit.pdfover.gui.utils; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.function.Consumer; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.ScrolledComposite; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.graphics.FontData; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.layout.FormAttachment; import org.eclipse.swt.layout.FormData; import org.eclipse.swt.widgets.Composite; 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; 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)); } private static void genericSetToolTipText(Object swtObj, String text) { try { Method m = swtObj.getClass().getMethod("setToolTipText", String.class); m.invoke(swtObj, text); } catch (NoSuchMethodException | IllegalAccessException e) { log.error("Attempted to setLocalizedToolTipText on object of type {}, which does not have an accessible setToolTipText method", swtObj.getClass().getSimpleName(), e); } catch (InvocationTargetException e) { log.error("Failed to setLocalizedToolTipText on object of type {}", swtObj.getClass().getSimpleName(), e); } } public static void setLocalizedToolTipText(Object o, String messageKey) { genericSetToolTipText(o, Messages.getString(messageKey));} public static void disableEventDefault(Control c, int event) { c.addListener(event, (Event e) -> { e.doit = false; }); } public static void scrollPassthrough(Control c) { c.addListener(SWT.MouseVerticalWheel, (Event e) -> { // disable default handling e.doit = false; // find containing ScrolledComposite Composite target = c.getParent(); while ((target != null) && !(target instanceof ScrolledComposite)) target = target.getParent(); if (target == null) return; // scroll containing ScrolledComposite ScrolledComposite sTarget = (ScrolledComposite)target; Point origin = sTarget.getOrigin(); origin.y -= (e.count * 10); sTarget.setOrigin(origin); }); } 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; private AnchorSetter(Control c, boolean isNew) { this.c = c; if (isNew) { this.fd = new FormData(); this.c.setLayoutData(this.fd); } else { Object layoutData = this.c.getLayoutData(); try { this.fd = (FormData)layoutData; } catch (ClassCastException e) { log.error("Tried to reanchor() object with layout data of type {} (not FormData)", layoutData.getClass().getSimpleName(), e); throw new RuntimeException("Invalid reanchor() use"); } } } 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, true); } public static AnchorSetter reanchor(Control c) { return new AnchorSetter(c, false); } /** * functional-interface wrapper around swtObj.addSelectionListener * @param swtObj SWT widget supporting addSelectionListener * @param callback widgetSelected method */ public static void addSelectionListener(Object swtObj, Consumer callback) { try { Method m = swtObj.getClass().getMethod("addSelectionListener", SelectionListener.class); m.invoke(swtObj, new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { callback.accept(e); } }); } catch (NoSuchMethodException | IllegalAccessException e) { log.error("Attempted to pass object of type {} to onSelectionChanged; object does not have an accessible addSelectionListener method", swtObj.getClass().getSimpleName(), e); } catch (InvocationTargetException e) { log.error("Failed to add selection listener on object of type {}", swtObj.getClass().getSimpleName(), e); } } }