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// Scintilla source code edit control
/** @file CallTip.cxx
** Code for displaying call tips.
**/
// Copyright 1998-2001 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.
#include <stdlib.h>
#include <string.h>
#include "Platform.h"
#include "Scintilla.h"
#include "CallTip.h"
#include <stdio.h>
#ifdef SCI_NAMESPACE
using namespace Scintilla;
#endif
static const int insetX = 5; // text inset in x from calltip border
static const int widthArrow = 14;
CallTip::CallTip() {
wCallTip = 0;
inCallTipMode = false;
posStartCallTip = 0;
val = 0;
rectUp = PRectangle(0,0,0,0);
rectDown = PRectangle(0,0,0,0);
lineHeight = 1;
startHighlight = 0;
endHighlight = 0;
tabSize = 0;
useStyleCallTip = false; // for backwards compatibility
#ifdef __APPLE__
// proper apple colours for the default
colourBG.desired = ColourDesired(0xff, 0xff, 0xc6);
colourUnSel.desired = ColourDesired(0, 0, 0);
#else
colourBG.desired = ColourDesired(0xff, 0xff, 0xff);
colourUnSel.desired = ColourDesired(0x80, 0x80, 0x80);
#endif
colourSel.desired = ColourDesired(0, 0, 0x80);
colourShade.desired = ColourDesired(0, 0, 0);
colourLight.desired = ColourDesired(0xc0, 0xc0, 0xc0);
}
CallTip::~CallTip() {
font.Release();
wCallTip.Destroy();
delete []val;
val = 0;
}
void CallTip::RefreshColourPalette(Palette &pal, bool want) {
pal.WantFind(colourBG, want);
pal.WantFind(colourUnSel, want);
pal.WantFind(colourSel, want);
pal.WantFind(colourShade, want);
pal.WantFind(colourLight, want);
}
// Although this test includes 0, we should never see a \0 character.
static bool IsArrowCharacter(char ch) {
return (ch == 0) || (ch == '\001') || (ch == '\002');
}
// We ignore tabs unless a tab width has been set.
bool CallTip::IsTabCharacter(char ch) const {
return (tabSize > 0) && (ch == '\t');
}
int CallTip::NextTabPos(int x) {
if (tabSize > 0) { // paranoia... not called unless this is true
x -= insetX; // position relative to text
x = (x + tabSize) / tabSize; // tab "number"
return tabSize*x + insetX; // position of next tab
} else {
return x + 1; // arbitrary
}
}
// Draw a section of the call tip that does not include \n in one colour.
// The text may include up to numEnds tabs or arrow characters.
void CallTip::DrawChunk(Surface *surface, int &x, const char *s,
int posStart, int posEnd, int ytext, PRectangle rcClient,
bool highlight, bool draw) {
s += posStart;
int len = posEnd - posStart;
// Divide the text into sections that are all text, or that are
// single arrows or single tab characters (if tabSize > 0).
int maxEnd = 0;
const int numEnds = 10;
int ends[numEnds + 2];
for (int i=0; i<len; i++) {
if ((maxEnd < numEnds) &&
(IsArrowCharacter(s[i]) || IsTabCharacter(s[i])) ) {
if (i > 0)
ends[maxEnd++] = i;
ends[maxEnd++] = i+1;
}
}
ends[maxEnd++] = len;
int startSeg = 0;
int xEnd;
for (int seg = 0; seg<maxEnd; seg++) {
int endSeg = ends[seg];
if (endSeg > startSeg) {
if (IsArrowCharacter(s[startSeg])) {
bool upArrow = s[startSeg] == '\001';
rcClient.left = x;
rcClient.right = rcClient.left + widthArrow;
if (draw) {
const int halfWidth = widthArrow / 2 - 3;
const int centreX = rcClient.left + widthArrow / 2 - 1;
const int centreY = (rcClient.top + rcClient.bottom) / 2;
surface->FillRectangle(rcClient, colourBG.allocated);
PRectangle rcClientInner(rcClient.left + 1, rcClient.top + 1,
rcClient.right - 2, rcClient.bottom - 1);
surface->FillRectangle(rcClientInner, colourUnSel.allocated);
if (upArrow) { // Up arrow
Point pts[] = {
Point(centreX - halfWidth, centreY + halfWidth / 2),
Point(centreX + halfWidth, centreY + halfWidth / 2),
Point(centreX, centreY - halfWidth + halfWidth / 2),
};
surface->Polygon(pts, sizeof(pts) / sizeof(pts[0]),
colourBG.allocated, colourBG.allocated);
} else { // Down arrow
Point pts[] = {
Point(centreX - halfWidth, centreY - halfWidth / 2),
Point(centreX + halfWidth, centreY - halfWidth / 2),
Point(centreX, centreY + halfWidth - halfWidth / 2),
};
surface->Polygon(pts, sizeof(pts) / sizeof(pts[0]),
colourBG.allocated, colourBG.allocated);
}
}
xEnd = rcClient.right;
offsetMain = xEnd;
if (upArrow) {
rectUp = rcClient;
} else {
rectDown = rcClient;
}
} else if (IsTabCharacter(s[startSeg])) {
xEnd = NextTabPos(x);
} else {
xEnd = x + surface->WidthText(font, s + startSeg, endSeg - startSeg);
if (draw) {
rcClient.left = x;
rcClient.right = xEnd;
surface->DrawTextTransparent(rcClient, font, ytext,
s+startSeg, endSeg - startSeg,
highlight ? colourSel.allocated : colourUnSel.allocated);
}
}
x = xEnd;
startSeg = endSeg;
}
}
}
int CallTip::PaintContents(Surface *surfaceWindow, bool draw) {
PRectangle rcClientPos = wCallTip.GetClientPosition();
PRectangle rcClientSize(0, 0, rcClientPos.right - rcClientPos.left,
rcClientPos.bottom - rcClientPos.top);
PRectangle rcClient(1, 1, rcClientSize.right - 1, rcClientSize.bottom - 1);
// To make a nice small call tip window, it is only sized to fit most normal characters without accents
int ascent = surfaceWindow->Ascent(font) - surfaceWindow->InternalLeading(font);
// For each line...
// Draw the definition in three parts: before highlight, highlighted, after highlight
int ytext = rcClient.top + ascent + 1;
rcClient.bottom = ytext + surfaceWindow->Descent(font) + 1;
char *chunkVal = val;
bool moreChunks = true;
int maxWidth = 0;
while (moreChunks) {
char *chunkEnd = strchr(chunkVal, '\n');
if (chunkEnd == NULL) {
chunkEnd = chunkVal + strlen(chunkVal);
moreChunks = false;
}
int chunkOffset = chunkVal - val;
int chunkLength = chunkEnd - chunkVal;
int chunkEndOffset = chunkOffset + chunkLength;
int thisStartHighlight = Platform::Maximum(startHighlight, chunkOffset);
thisStartHighlight = Platform::Minimum(thisStartHighlight, chunkEndOffset);
thisStartHighlight -= chunkOffset;
int thisEndHighlight = Platform::Maximum(endHighlight, chunkOffset);
thisEndHighlight = Platform::Minimum(thisEndHighlight, chunkEndOffset);
thisEndHighlight -= chunkOffset;
rcClient.top = ytext - ascent - 1;
int x = insetX; // start each line at this inset
DrawChunk(surfaceWindow, x, chunkVal, 0, thisStartHighlight,
ytext, rcClient, false, draw);
DrawChunk(surfaceWindow, x, chunkVal, thisStartHighlight, thisEndHighlight,
ytext, rcClient, true, draw);
DrawChunk(surfaceWindow, x, chunkVal, thisEndHighlight, chunkLength,
ytext, rcClient, false, draw);
chunkVal = chunkEnd + 1;
ytext += lineHeight;
rcClient.bottom += lineHeight;
maxWidth = Platform::Maximum(maxWidth, x);
}
return maxWidth;
}
void CallTip::PaintCT(Surface *surfaceWindow) {
if (!val)
return;
PRectangle rcClientPos = wCallTip.GetClientPosition();
PRectangle rcClientSize(0, 0, rcClientPos.right - rcClientPos.left,
rcClientPos.bottom - rcClientPos.top);
PRectangle rcClient(1, 1, rcClientSize.right - 1, rcClientSize.bottom - 1);
surfaceWindow->FillRectangle(rcClient, colourBG.allocated);
offsetMain = insetX; // initial alignment assuming no arrows
PaintContents(surfaceWindow, true);
#ifndef __APPLE__
// OSX doesn't put borders on "help tags"
// Draw a raised border around the edges of the window
surfaceWindow->MoveTo(0, rcClientSize.bottom - 1);
surfaceWindow->PenColour(colourShade.allocated);
surfaceWindow->LineTo(rcClientSize.right - 1, rcClientSize.bottom - 1);
surfaceWindow->LineTo(rcClientSize.right - 1, 0);
surfaceWindow->PenColour(colourLight.allocated);
surfaceWindow->LineTo(0, 0);
surfaceWindow->LineTo(0, rcClientSize.bottom - 1);
#endif
}
void CallTip::MouseClick(Point pt) {
clickPlace = 0;
if (rectUp.Contains(pt))
clickPlace = 1;
if (rectDown.Contains(pt))
clickPlace = 2;
}
PRectangle CallTip::CallTipStart(int pos, Point pt, const char *defn,
const char *faceName, int size,
int codePage_, int characterSet, Window &wParent) {
clickPlace = 0;
delete []val;
val = 0;
val = new char[strlen(defn) + 1];
strcpy(val, defn);
codePage = codePage_;
Surface *surfaceMeasure = Surface::Allocate();
if (!surfaceMeasure)
return PRectangle();
surfaceMeasure->Init(wParent.GetID());
surfaceMeasure->SetUnicodeMode(SC_CP_UTF8 == codePage);
surfaceMeasure->SetDBCSMode(codePage);
startHighlight = 0;
endHighlight = 0;
inCallTipMode = true;
posStartCallTip = pos;
int deviceHeight = surfaceMeasure->DeviceHeightFont(size);
font.Create(faceName, characterSet, deviceHeight, false, false);
// Look for multiple lines in the text
// Only support \n here - simply means container must avoid \r!
int numLines = 1;
const char *newline;
const char *look = val;
rectUp = PRectangle(0,0,0,0);
rectDown = PRectangle(0,0,0,0);
offsetMain = insetX; // changed to right edge of any arrows
int width = PaintContents(surfaceMeasure, false) + insetX;
while ((newline = strchr(look, '\n')) != NULL) {
look = newline + 1;
numLines++;
}
lineHeight = surfaceMeasure->Height(font);
// Extra line for border and an empty line at top and bottom. The returned
// rectangle is aligned to the right edge of the last arrow encountered in
// the tip text, else to the tip text left edge.
int height = lineHeight * numLines - surfaceMeasure->InternalLeading(font) + 2 + 2;
delete surfaceMeasure;
return PRectangle(pt.x - offsetMain, pt.y + 1, pt.x + width - offsetMain, pt.y + 1 + height);
}
void CallTip::CallTipCancel() {
inCallTipMode = false;
if (wCallTip.Created()) {
wCallTip.Destroy();
}
}
void CallTip::SetHighlight(int start, int end) {
// Avoid flashing by checking something has really changed
if ((start != startHighlight) || (end != endHighlight)) {
startHighlight = start;
endHighlight = end;
if (wCallTip.Created()) {
wCallTip.InvalidateAll();
}
}
}
// Set the tab size (sizes > 0 enable the use of tabs). This also enables the
// use of the STYLE_CALLTIP.
void CallTip::SetTabSize(int tabSz) {
tabSize = tabSz;
useStyleCallTip = true;
}
// It might be better to have two access functions for this and to use
// them for all settings of colours.
void CallTip::SetForeBack(const ColourPair &fore, const ColourPair &back) {
colourBG = back;
colourUnSel = fore;
}