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394 lines
16 KiB
394 lines
16 KiB
9 years ago
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/*
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XOWA: the XOWA Offline Wiki Application
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Copyright (C) 2012 gnosygnu@gmail.com
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package gplx.gfui;
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import gplx.*;
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import gplx.core.envs.Op_sys;
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import gplx.core.envs.Op_sys_;
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import gplx.core.threads.Thread_adp_;
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import org.eclipse.swt.SWT;
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import org.eclipse.swt.events.SelectionEvent;
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import org.eclipse.swt.events.SelectionListener;
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import org.eclipse.swt.graphics.Color;
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import org.eclipse.swt.graphics.Point;
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import org.eclipse.swt.graphics.Rectangle;
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import org.eclipse.swt.layout.FillLayout;
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import org.eclipse.swt.layout.GridData;
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import org.eclipse.swt.widgets.Composite;
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import org.eclipse.swt.widgets.Control;
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import org.eclipse.swt.widgets.Display;
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import org.eclipse.swt.widgets.Event;
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import org.eclipse.swt.widgets.Listener;
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import org.eclipse.swt.widgets.Shell;
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import org.eclipse.swt.widgets.Table;
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import org.eclipse.swt.widgets.TableItem;
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import org.eclipse.swt.widgets.Text;
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public class Swt_combo_ctrl extends Swt_text_w_border implements GxwElem, GxwComboBox, Swt_control, GfoEvMgrOwner { // REF: https://www.eclipse.org/forums/index.php/t/351029/; http://git.eclipse.org/c/platform/eclipse.platform.swt.git/tree/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet320.java
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private final Text swt_text;
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private final Swt_combo_list list;
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public Swt_combo_ctrl(Swt_control owner, Color color, Keyval_hash ctorArgs) {
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super(owner, color, new Keyval_hash());
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Display display = owner.Under_control().getDisplay();
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Shell shell = owner.Under_control().getShell();
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this.swt_text = super.Under_text();
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this.list = new Swt_combo_list(display, shell, this);
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swt_text.addListener(SWT.KeyDown, new Swt_combo_text__key_down(list));
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swt_text.addListener(SWT.MouseUp, new Swt_combo_text__mouse_up(list));
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Table swt_list = list.Under_table_as_swt();
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swt_list.addListener(SWT.DefaultSelection, new Swt_combo_list__default_selection(this, list));
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swt_list.addListener(SWT.KeyDown, new Swt_combo_list__default_selection(this, list));
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swt_list.addListener(SWT.MouseDown, new Swt_combo_list__mouse_down(this, list));
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// listeners to hide list-box when focus is transfered, shell is moved, text-box is clicked, etc
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Swt_combo_ctrl__list_hider_cmd list_hide_cmd = new Swt_combo_ctrl__list_hider_cmd(list);
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Swt_combo_ctrl__focus_out focus_out_lnr = new Swt_combo_ctrl__focus_out(display, this, list, list_hide_cmd);
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swt_text.addListener(SWT.FocusOut, focus_out_lnr);
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swt_list.addListener(SWT.FocusOut, focus_out_lnr);
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swt_text.addListener(SWT.FocusIn, new Swt_combo_text__focus_in(this, list));
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swt_list.addListener(SWT.FocusIn, new Swt_combo_ctrl__focus_in(display, list, list_hide_cmd));
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shell.addListener(SWT.Move, new Swt_combo_shell__move(list));
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}
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@Override public GfoEvMgr EvMgr() {return ev_mgr;} private GfoEvMgr ev_mgr; public void EvMgr_(GfoEvMgr v) {ev_mgr = v;}
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@Override public Object SelectedItm() {return null;}
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@Override public void SelectedItm_set(Object v) {}
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@Override public void Sel_(int bgn, int end) {swt_text.setSelection(new Point(bgn, end));}
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@Override public String[] DataSource_as_str_ary() {return list.Items_str_ary();}
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@Override public void DataSource_set(Object... ary) {list.Items_((String[])ary);}
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@Override public String Text_fallback() {return text_fallback;} private String text_fallback = "";// preserve original-text when using cursor keys in list-box
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@Override public void Text_fallback_(String v) {text_fallback = v;}
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public void Text_fallback_restore() {
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if (String_.Len_eq_0(text_fallback)) return; // handle escape pressed after dropdown is visible, but down / up not pressed
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this.Text_(text_fallback);
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this.text_fallback = "";
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}
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@Override public void Items__update(String[] ary) {list.Items_(ary);}
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@Override public void Items__size_to_fit(int count) {list.Resize_shell(count);}
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@Override public int List_sel_idx() {return list.Sel_idx();}
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@Override public void List_sel_idx_(int v) {list.Sel_idx_(v);}
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@Override public boolean List_visible() {return list.Visible();}
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@Override public void List_visible_(boolean v) {list.Visible_(v);}
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@Override public void Items__visible_rows_(int v) {list.Visible_rows = v;}
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@Override public void Items__jump_len_(int v) {list.Jump_len = v;}
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public Rectangle Bounds() {return super.Under_control().getBounds();}
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public String Text() {return swt_text.getText();} public void Text_(String v) {swt_text.setText(v);}
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public void Sel_all() {
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String text_text = swt_text.getText();
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this.Sel_(0, String_.Len(text_text));
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}
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}
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class Swt_combo_list {
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private final Display display; private final Shell owner_shell;
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private final Swt_combo_ctrl ctrl;
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private final Shell shell;
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private final Table table;
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private int list_len;
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public int Jump_len = 5;
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public int Visible_rows = 10;
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public Swt_combo_list(Display display, Shell owner_shell, Swt_combo_ctrl ctrl) {
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this.display = display; this.owner_shell = owner_shell; this.ctrl = ctrl;
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this.shell = new Shell(display, SWT.ON_TOP);
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shell.setLayout(new FillLayout());
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this.table = new Table(shell, SWT.SINGLE);
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}
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public Table Under_table_as_swt() {return table;}
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public int Items_len() {return table.getItemCount();}
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public TableItem[] Items() {return table.getItems();}
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public TableItem Sel_itm(int i) {return table.getSelection()[i];}
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public void Items_text_(int idx, String v) {table.getItem(idx).setText(v);}
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public String[] Items_str_ary() {return items_str_ary;} private String[] items_str_ary = String_.Ary_empty;
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public void Items_(String[] new_ary) {
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int new_len = new_ary.length;
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if (new_len == 0) Visible_(Bool_.N); // if new_ary is empty, then hide list box; else, brief flicker as items are removed
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// remove all cur-items that are no longer needed b/c new_ary is smaller
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int cur_len = list_len;
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for (int i = new_len; i < cur_len; ++i) {
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table.remove(new_len);
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}
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// update new_ary;
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for (int i = 0; i < new_len; ++i) {
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TableItem item = null;
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if (i < cur_len) // existing item; reuse it
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item = table.getItem(i);
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else // no ite; create a new one
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item = new TableItem(table, SWT.NONE);
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String cur_text = item.getText();
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String new_text = new_ary[i];
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if (!String_.Eq(cur_text, new_text) && new_text != null) {
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item.setText(new_text);
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}
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}
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this.list_len = new_len;
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// resize list-shell to # of items
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int max_len = this.Visible_rows;
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if ( new_len == cur_len // do not resize if same #
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|| new_len > max_len && cur_len > max_len // do not resize if new_len and cur_len are both off-screen
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) {}
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this.items_str_ary = new_ary;
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// else
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// Resize_shell(list_len);
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}
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public int Sel_idx() {return table.getSelectionIndex();}
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public void Sel_idx_(int v) {table.setSelection(v);}
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public void Sel_idx_nudge(boolean fwd) {Sel_idx_adj(fwd, 1);}
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public void Sel_idx_jump(boolean fwd) {Sel_idx_adj(fwd, Jump_len);}
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private void Sel_idx_adj(boolean fwd, int adj) {
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if (!Visible()) Visible_(Bool_.Y); // these are called by cursor keys; always make visible
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int cur_idx = table.getSelectionIndex();
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int new_idx = cur_idx;
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int idx_n = list_len - 1;
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if (fwd) {
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if (cur_idx == idx_n)
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new_idx = -1;
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else if (cur_idx == -1)
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new_idx = 0;
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else {
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new_idx = cur_idx + adj;
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if (new_idx >= idx_n)
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new_idx = idx_n;
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}
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}
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else {
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if (cur_idx == 0)
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new_idx = -1;
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else if (cur_idx == -1)
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new_idx = idx_n;
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else {
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new_idx = cur_idx - adj;
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if (new_idx < 0)
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new_idx = 0;
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}
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}
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Sel_idx_by_key(new_idx);
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}
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public void Sel_idx_by_key(int v) {
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table.setSelection(v);
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if (v == -1) { // nothing selected; restore orig
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ctrl.Text_fallback_restore();
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} else { // something selected; transfer selected item to text
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String sel_text = table.getItem(v).getText();
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ctrl.Text_(sel_text);
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ctrl.Sel_(sel_text.length(), sel_text.length());
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}
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GfoEvMgr_.Pub(ctrl, GfuiComboBox.Evt__selected_changed);
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}
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public boolean Visible() {return shell.isVisible();}
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public void Visible_(boolean v) {
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if (v && list_len == 0) return; // never show if 0 items; occurs when users presses alt+down or down when in combo-box
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shell.setVisible(v);
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}
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public void Resize_shell(int len) {
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Rectangle text_bounds = display.map(owner_shell, null, ctrl.Bounds());
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int adj = Op_sys.Cur().Tid() == Op_sys.Lnx.Tid() ? 9 : 2; // NOTE: magic-numbers from gnosygnu's Windows-7, OS-X and openSUSE; Linux # is not correct for different number of items, but looks acceptable for 25;
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int max_len = this.Visible_rows;
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int height = (table.getItemHeight() * (len > max_len ? max_len : len)) + adj;
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if (height != shell.getSize().y) // only resize if height is different
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shell.setBounds(text_bounds.x, text_bounds.y + text_bounds.height - 1, text_bounds.width, height);
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}
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}
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class Swt_combo_text__key_down implements Listener { // for list-box, highlight item or toggle visiblility based on keys
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private final Swt_combo_list list;
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public Swt_combo_text__key_down(Swt_combo_list list) {
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this.list = list;
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}
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@Override public void handleEvent(Event event) {
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try {
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int mask = event.stateMask;
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boolean no_modifier = false;
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boolean ctrl_modifier = false;
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boolean alt_modifier = false;
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if ((mask & SWT.ALT) == SWT.ALT) {alt_modifier = true;}
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else if ((mask & SWT.CTRL) == SWT.CTRL){ctrl_modifier = true;}
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else if ((mask & SWT.SHIFT) == SWT.SHIFT){}
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else
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no_modifier = true;
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switch (event.keyCode) {
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case SWT.ARROW_DOWN:
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if (event.stateMask == SWT.ALT) {
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list.Visible_(true);
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} else {
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list.Sel_idx_nudge(Bool_.Y);
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}
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event.doit = false;
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break;
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case SWT.ARROW_UP:
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if (event.stateMask == SWT.ALT) {
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list.Visible_(false);
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} else {
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list.Sel_idx_nudge(Bool_.N);
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}
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event.doit = false;
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break;
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case SWT.PAGE_DOWN:
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if (no_modifier) {
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list.Sel_idx_jump(Bool_.Y);
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event.doit = false;
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}
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else if (ctrl_modifier || alt_modifier) {
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list.Visible_(Bool_.N);
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event.doit = false;
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}
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break;
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case SWT.PAGE_UP:
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if (no_modifier) {
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list.Sel_idx_jump(Bool_.N);
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event.doit = false;
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}
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else if (ctrl_modifier || alt_modifier) {
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list.Visible_(Bool_.N);
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event.doit = false;
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}
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break;
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case SWT.CR:
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if (list.Visible() && list.Sel_idx() != -1) {
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list.Visible_(false);
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}
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break;
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case SWT.ESC:
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list.Sel_idx_by_key(-1);
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list.Visible_(false);
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break;
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
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class Swt_combo_text__mouse_up implements Listener { // if list-box is visible, left-click on text-box should hide list-box; note that left-click does not fire focus-in event; EX: focus html-box; click on url-box; focus-in event not fired
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private final Swt_combo_list list;
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public Swt_combo_text__mouse_up(Swt_combo_list list) {
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this.list = list;
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}
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@Override public void handleEvent(Event event) {
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if (event.button == 1) { // left-click
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if (list.Visible()) {
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list.Visible_(false);
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}
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}
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}
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}
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class Swt_combo_list__default_selection implements Listener { // transfer list-box's selected to text-box
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private final Swt_combo_ctrl ctrl; private final Swt_combo_list list;
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public Swt_combo_list__default_selection(Swt_combo_ctrl ctrl, Swt_combo_list list) {
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this.ctrl = ctrl; this.list = list;
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}
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@Override public void handleEvent(Event arg0) {
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ctrl.Text_(list.Sel_itm(0).getText());
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list.Visible_(false);
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}
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}
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class Swt_combo_list__key_down implements Listener { // hide list-box if escape pressed
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private final Swt_combo_ctrl ctrl; private final Swt_combo_list list;
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public Swt_combo_list__key_down(Swt_combo_ctrl ctrl, Swt_combo_list list) {
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this.ctrl = ctrl;
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this.list = list;
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}
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@Override public void handleEvent(Event event) {
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if (event.keyCode == SWT.ESC) {
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ctrl.Text_fallback_restore();
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||
|
|
list.Visible_(false);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
class Swt_combo_list__mouse_down implements Listener { // left-click on list-box should transfer item to text-box and publish "accepted" event
|
||
|
|
private final Swt_combo_ctrl ctrl;
|
||
|
|
private final Swt_combo_list list;
|
||
|
|
public Swt_combo_list__mouse_down(Swt_combo_ctrl ctrl, Swt_combo_list list) {
|
||
|
|
this.ctrl = ctrl;
|
||
|
|
this.list = list;
|
||
|
|
}
|
||
|
|
@Override public void handleEvent(Event event) {
|
||
|
|
if (event.button == 1) { // left-click
|
||
|
|
ctrl.Text_(list.Sel_itm(0).getText());
|
||
|
|
GfoEvMgr_.Pub(ctrl, GfuiComboBox.Evt__selected_changed);
|
||
|
|
GfoEvMgr_.Pub(ctrl, GfuiComboBox.Evt__selected_accepted);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
class Swt_combo_ctrl__focus_out implements Listener { // run hide-cmd when list-box when text-box / list-box loses focus
|
||
|
|
private final Display display;
|
||
|
|
private final Control text_as_swt, list_as_swt;
|
||
|
|
private final Swt_combo_ctrl__list_hider_cmd list_hide_cmd;
|
||
|
|
public Swt_combo_ctrl__focus_out(Display display, Swt_combo_ctrl ctrl, Swt_combo_list list, Swt_combo_ctrl__list_hider_cmd list_hide_cmd) {
|
||
|
|
this.list_hide_cmd = list_hide_cmd;
|
||
|
|
this.display = display;
|
||
|
|
this.text_as_swt = ctrl.Under_text();
|
||
|
|
this.list_as_swt = list.Under_table_as_swt();
|
||
|
|
}
|
||
|
|
@Override public void handleEvent(Event arg0) {
|
||
|
|
if (display.isDisposed()) return;
|
||
|
|
Control control = display.getFocusControl();
|
||
|
|
if (control == null || control == text_as_swt || control == list_as_swt) {
|
||
|
|
list_hide_cmd.Active = true;
|
||
|
|
display.asyncExec(list_hide_cmd);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
class Swt_combo_ctrl__focus_in implements Listener { // cancel hide-cmd if list-box gains focus
|
||
|
|
private final Display display;
|
||
|
|
private final Swt_combo_ctrl__list_hider_cmd list_hide_cmd;
|
||
|
|
private final Control list_as_swt;
|
||
|
|
|
||
|
|
public Swt_combo_ctrl__focus_in(Display display, Swt_combo_list list, Swt_combo_ctrl__list_hider_cmd list_hide_cmd) {
|
||
|
|
this.display = display;
|
||
|
|
this.list_as_swt = list.Under_table_as_swt();
|
||
|
|
this.list_hide_cmd = list_hide_cmd;
|
||
|
|
}
|
||
|
|
@Override public void handleEvent(Event arg0) {
|
||
|
|
if (display.isDisposed()) return;
|
||
|
|
Control control = display.getFocusControl();
|
||
|
|
if (control == list_as_swt)
|
||
|
|
list_hide_cmd.Active = false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
class Swt_combo_text__focus_in implements Listener { // hide list-box when text-box is focused
|
||
|
|
private final Swt_combo_ctrl ctrl; private final Swt_combo_list list;
|
||
|
|
public Swt_combo_text__focus_in(Swt_combo_ctrl ctrl, Swt_combo_list list) {
|
||
|
|
this.ctrl = ctrl; this.list = list;
|
||
|
|
}
|
||
|
|
@Override public void handleEvent(Event arg0) {
|
||
|
|
if (list.Visible())
|
||
|
|
list.Visible_(false);
|
||
|
|
else
|
||
|
|
ctrl.Sel_all();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
class Swt_combo_shell__move implements Listener { // hide list-box when shell is moved
|
||
|
|
private final Swt_combo_list list;
|
||
|
|
public Swt_combo_shell__move(Swt_combo_list list) {this.list = list;}
|
||
|
|
@Override public void handleEvent(Event arg0) {
|
||
|
|
list.Visible_(false);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
class Swt_combo_ctrl__list_hider_cmd implements Runnable { // hide list-box; can be "canceled"
|
||
|
|
private final Swt_combo_list list;
|
||
|
|
public boolean Active = true;
|
||
|
|
public Swt_combo_ctrl__list_hider_cmd(Swt_combo_list list) {
|
||
|
|
this.list = list;
|
||
|
|
}
|
||
|
|
@Override public void run() {
|
||
|
|
if (Active)
|
||
|
|
list.Visible_(false);
|
||
|
|
}
|
||
|
|
}
|