text box for input

1 files changed, 287 insertions, 0 deletions

diff --git a/src/FbTk/TextBox.cc b/src/FbTk/TextBox.cc
new file mode 100644
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+++ b/src/FbTk/TextBox.cc
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+// TextBox.cc for FbTk - fluxbox toolkit
+// Copyright (c) 2003 Henrik Kinnunen (fluxgen at users.sourceforge.net)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+// $Id: TextBox.cc,v 1.1 2003/08/26 23:24:48 fluxgen Exp $
+
+#include "TextBox.hh"
+#include "Font.hh"
+#include "EventManager.hh"
+#include "App.hh"
+
+#include <cctype>
+#include <X11/keysym.h>
+#include <X11/Xutil.h>
+
+namespace FbTk {
+
+TextBox::TextBox(int screen_num,
+                 const Font &font, const std::string &text):
+    FbWindow(screen_num, 0, 0, 1, 1, ExposureMask | KeyPressMask | ButtonPressMask),
+    m_font(&font),
+    m_text(text),
+    m_gc(0),
+    m_cursor_pos(0),
+    m_start_pos(0),
+    m_end_pos(0) {
+
+    FbTk::EventManager::instance()->add(*this, *this);
+}
+
+TextBox::TextBox(const FbWindow &parent, 
+                 const Font &font, const std::string &text):
+    FbWindow(parent, 0, 0, 1, 1, ExposureMask | KeyPressMask | ButtonPressMask),
+    m_font(&font),
+    m_text(text),
+    m_gc(0),
+    m_cursor_pos(0),
+    m_start_pos(0),
+    m_end_pos(0) {
+
+    FbTk::EventManager::instance()->add(*this, *this);
+}
+
+TextBox::~TextBox() {
+
+}
+
+void TextBox::setText(const std::string &text) {
+    m_text = text;
+    cursorEnd();
+    adjustStartPos();
+}
+
+void TextBox::setFont(const Font &font) {
+    m_font = &font;
+}
+
+void TextBox::setGC(GC gc) {
+    m_gc = gc;
+}
+
+void TextBox::setInputFocus() {
+    XSetInputFocus(FbTk::App::instance()->display(),
+                   window(),
+                   RevertToParent,
+                   CurrentTime);
+}
+
+void TextBox::cursorHome() {
+    m_start_pos = m_cursor_pos = 0;
+}
+
+void TextBox::cursorEnd() {
+    m_cursor_pos = m_end_pos = text().size();
+}
+
+void TextBox::cursorForward() {
+    if (m_start_pos + cursorPosition() < m_end_pos)
+        m_cursor_pos++;
+    else if (m_end_pos < text().size()) {
+        m_cursor_pos++;
+        m_end_pos++;
+        adjustStartPos();
+    }
+}
+
+void TextBox::cursorBackward() {
+    if (cursorPosition())
+        m_cursor_pos--;
+    else if (m_start_pos) {
+        m_start_pos--;
+        adjustEndPos();
+    }
+}
+
+void TextBox::backspace() {
+    if (m_start_pos || cursorPosition()) {
+        m_text.erase(m_start_pos + cursorPosition() - 1, 1);
+        if (cursorPosition())
+            setCursorPosition(cursorPosition() - 1);
+        else
+            m_start_pos--;
+        adjustEndPos();
+    }
+}
+
+void TextBox::deleteForward() {
+    if (m_start_pos + m_cursor_pos < m_end_pos) {
+        m_text.erase(m_start_pos + m_cursor_pos, 1);
+        adjustEndPos();
+    }
+}
+
+void TextBox::insertText(const std::string &val) {
+    m_text.insert(m_start_pos + cursorPosition(), val);
+    m_cursor_pos += val.size();
+    m_end_pos += val.size();
+    if (m_start_pos + cursorPosition() < m_end_pos)
+        adjustEndPos();
+    else
+        adjustStartPos();
+}
+
+void TextBox::killToEnd() {
+    if (cursorPosition() < text().size()) {
+        m_text.erase(cursorPosition());
+        setText(m_text);
+    }
+}
+
+void TextBox::clear() {
+    FbWindow::clear();
+    // center text by default
+    int center_pos = (height() + font().ascent())/2;
+    if (gc() == 0)
+        setGC(DefaultGC(FbTk::App::instance()->display(), screenNumber()));
+
+    font().drawText(window(), screenNumber(), 
+                    gc(),                     
+                    text().c_str() + m_start_pos, 
+                    m_end_pos - m_start_pos, 
+                    0, center_pos); // pos
+
+    // draw cursor position
+    int cursor_pos = font().textWidth(text().c_str() + m_start_pos, m_cursor_pos) + 1;
+    drawLine(gc(), cursor_pos, 0, cursor_pos, font().height());
+}
+
+void TextBox::moveResize(int x, int y,
+                         unsigned int width, unsigned int height) {
+    FbWindow::moveResize(x, y, width, height);
+    clear();
+}
+
+void TextBox::resize(unsigned int width, unsigned int height) {
+    FbWindow::resize(width, height);
+    clear();
+}
+
+void TextBox::exposeEvent(XExposeEvent &event) {
+    clear();
+}
+
+void TextBox::buttonPressEvent(XButtonEvent &event) {
+    setInputFocus();
+}
+
+void TextBox::keyPressEvent(XKeyEvent &event) {
+    KeySym ks;
+    char keychar[1];
+    XLookupString(&event, keychar, 1, &ks, 0);
+    // a modifier key by itself doesn't do anything
+    if (IsModifierKey(ks)) return;
+
+    if (event.state) { // handle keybindings without state
+        if (event.state == ControlMask) {
+
+            switch (ks) {
+            case XK_b:
+                cursorBackward();
+                break;
+            case XK_f:
+                cursorForward();
+                break;
+            case XK_a:
+                cursorHome();
+                break;
+            case XK_e:
+                cursorEnd();
+                break;
+            case XK_d:
+                deleteForward();
+                break;
+            case XK_k:
+                killToEnd();
+                break;
+            }
+        } else if (event.state == ShiftMask) {
+            if (isprint(keychar[0])) {
+                std::string val;
+                val += keychar[0];
+                insertText(val);
+            }
+        }
+
+    } else { // no state
+
+        switch (ks) {
+        case XK_BackSpace:
+            backspace();
+            break;
+        case XK_Home:
+            cursorHome();
+            break;
+        case XK_End:
+            cursorEnd();
+            break;
+        case XK_Left:
+            cursorBackward();
+            break;
+        case XK_Right:
+            cursorForward();
+            break;
+        default:
+            if (isprint(keychar[0])) {
+                std::string val;
+                val += keychar[0];
+                insertText(val);
+            }
+        }
+    }
+    clear();
+}
+
+void TextBox::setCursorPosition(int pos) {
+    m_cursor_pos = pos;
+    if (m_cursor_pos > text().size())
+        cursorEnd();
+    else if (m_cursor_pos < 0)
+        cursorHome();
+}
+
+void TextBox::adjustEndPos() {
+    m_end_pos = text().size();
+    int text_width = font().textWidth(text().c_str() + m_start_pos, m_end_pos - m_start_pos);
+    while (text_width > width()) {
+        m_end_pos--;
+        text_width = font().textWidth(text().c_str() + m_start_pos, m_end_pos - m_start_pos);
+    }
+}
+
+void TextBox::adjustStartPos() {
+    int text_width = font().textWidth(text().c_str() + m_start_pos, m_end_pos - m_start_pos);
+    if (text_width < width())
+        return;
+
+    int start_pos = 0;
+    text_width = font().textWidth(text().c_str() + start_pos, m_end_pos - start_pos);
+    while (text_width > width()) {
+        start_pos++;
+        text_width = font().textWidth(text().c_str() + start_pos, m_end_pos - start_pos);
+    }
+    // adjust cursorPosition() according relative to change to m_start_pos
+    m_cursor_pos -= start_pos - m_start_pos;
+    m_start_pos = start_pos;
+}
+
+
+
+}; // end namespace FbTk